The 2002 iMac is definitely different with its 10.5″ hemispherical base and 15″ flat panel display. Definitely different. Steve Jobs says the design was inspired by a sunflower.

• Need Help Upgrading Or Adding Airport Imac G4 Pro
• Need Help Upgrading Or Adding Airport Imac G4 Drivers
• Need Help Upgrading Or Adding Airport Imac G4 Specs
• Need Help Upgrading Or Adding Airport Imac G4 Unlocked

1. Need help deciding between imacG5 and Mac Mini I am shopping for a new computer and then decided to switch to mac. But thing is, there are too much to choose from. I should take the iMac G5 with the super drive. But I am kinda attracted to the charm of the mac mini.
2. How to install an airport extreme card into a PowerBook G4 12 inch laptop. Does your Mac need repair?

Originally known as 'The New iMac' the iMac G4 was created to replace the iMac G3 as Apple's all-in-one desktop computer. The G4 is easily recognizable by its swiveling monitor mounted above the hemispherical computer. Steve Jobs quoted it as being 'a design that will last till the next decade.'

All three versions feature a G4 processor and can burn CDs. The less expensive models have a 700 MHz G4, and the middle of the line has a Combo drive. The top-end iMac runs an 800 MHz G4 and has a SuperDrive so you can burn DVDs.

Although Jobs didn’t mention it at the January 2002 Macworld Expo, the G4 iMac has a new keyboard, one with white keys and gray letters, not the old harder-to-read, lower contrast black keys with gray letters.

The new iMac is also about 35% lighter than the old one and draws less power.

These are also the first iMacs with Nvidia graphics – the GeForce2 MX with 2x AGP and 32 MB video RAM is standard across the line.

• Got an iMac? Join our iMac Group or iMacs & eMacs Forum.
• Our Mac OS 9 Group is for those using Mac OS 9, either natively or in Classic Mode.
• Our Puma Group is for those using Mac OS X 10.1.
• Our Jaguar Group is for those using Mac OS X 10.2.
• Our Panther Group is for those using Mac OS X 10.3.
• Our Tiger Group is for those using Mac OS X 10.4.
• Our Leopard Group is for those using Mac OS X 10.5 and 10.6.

Beware Apple’s specs, which claims the G4 iMac has 5 USB ports. They get this number by adding the three ports on the iMac to the two on the keyboard, nicely ignoring the fact that the computer itself has only 3 ports and the keyboard ties up a port when it’s connected.

Some Leopard users have reported problems with G4 iMacs that have GeForce2 or GeForce4 graphics. When the system wakes from sleep, the screen will be completely white, making the computer unusable. This is fixed by Leopard Graphics Update 1.0, which requires OS X 10.5.2 or later.

Details

• introduced 2002.01.07 at US$1,299 (700 MHz, CD-RW), $1,499 (700 MHz, Combo), and $1,799 (800 MHz, SuperDrive); replaced by a single 800 MHz model 2003.02.04
• Part no.: M8672 (CD-RW), M7677 (Combo), M8535 (SuperDrive)
• Model identifier: PowerMac4,2

Mac OS

• Requires Mac OS 9.2.2 or later, OS X 10.1.2 through 10.5.x, 10.5 not officially supported

Core System

• CPU: 700/800 MHz G4
• L2 cache: 256 KB on-chip cache running at full CPU speed
• Bus: 100 MHz
• RAM: 128/256 MB, expandable to 1 GB using one user accessible 144-pin PC133 SODIMM (up to 512 MB) and one 168-pin PC133 DIMM (also up to 512 MB)
• Performance:
  • Geekbench 2 (Tiger): 348 (700 MHz), 414 (800 MHz)

Video

• Graphics: Nvidia GeForce 2 MX with AGP 2x support
• VRAM: 32 MB
• Display: 15″ 1024 x 768 flat panel display

Drives

• Hard drive: 40/60 GB Ultra ATA drive
• CD-RW (24/10/32x), Combo drive (12/8/32x), or SuperDrive (8/8/24x)

Expansion

• USB: 3 USB 1.1 ports
• FireWire 400: 2 ports
• Modem: built-in v.90 56k modem
• Ethernet: 10/100Base-T
• WiFi: 802.11b AirPort optional
• Microphone: internal

Physical

• Power supply: 130W
• PRAM battery: 3.6V half-AA
• Height: 12.95-20.0 in/32.9-50.9 cm
• Width: 15.1 in/38.3 cm
• Depth: 10.6-16.3 in/27.0-41.5 cm
• Weight: 21.3 lb/9.7 kg

Upgrades

• 8x SuperDrive DVD±RW upgrade, MCE Technologies, $149. 8x4x12x DVD, 24x24x40x CD. 2 MB buffer. Must be installed by MCE or an MCE authorized upgrade center.

Online Resources

• Best iMac G4 deals.
• Best Classic Mac OS Deals. Best online prices for System 6, 7.1, 7.5.x, Mac OS 7.6, 8.0, 8.1, 8.5, 9.0, 9.2.2, and other versions.
• Best Mac OS X 10.0-10.3 Deals. Best online prices for Mac OS X 10.0, 10.1, 10.2, and 10.3.
• Best Mac OS X 10.4 Tiger Deals. Best online prices for Mac OS X 10.4.
• Best Mac OS X 10.5 Leopard Deals. Best online prices for Mac OS X 10.5.
• What’s the Best Version of OS X for My Mac?, Ian R Campbell, The Sensible Mac, 2008.02.28. Which version of Mac OS X is best for your hardware depends on several factors.
• Unsupported Leopard installation, Dan Knight, 2007.10.31. How to install Mac OS X 10.5 on unsupported hardware – plus field reports.
• Faking out the Leopard installer with Open Firmware, Dylan McDermond, Unsupported Leopard, 2007.12.06. You don’t have to hack the installer to make the Mac OS X 10.5 installer run on sub-867 MHz G4 Macs by using this simple Open Firmware trick.
• Low End Mac’s Compleat Guide to Mac OS 9, Charles W Moore, Miscellaneous Ramblings, 2008.05.12. Mac OS 9 remains fast and stable, but Classic software hasn’t kept up with the changing internet. Which Macs support OS 9, where to buy it, and how to update to 9.2.2.
• The iMac Legacy: After the G3, Dan Knight, Mac Musings, 2008.08.15. The G3 iMac influenced the whole industry, but Apple continued to move forward with innovative designs using G4, G5, and Intel processors.
• iMac (Flat Panel) and iMac (17-inch Flat Panel): Installing or Replacing Memory, Apple. How to access and upgrade RAM in the iMac’s “user accessible” memory socket.
• iMac G4 – Exchanging Optical Drive, Hard Disk, and RAM, Accelerate Your Mac, 2002.07.13 (updated). Looks like this covers every version of G4 iMac.
• Know Your Mac’s Upgrade Options, Phil Herlihy, The Usefulness Equation, 2008.08.26. Any Mac can be upgraded, but it’s a question of what can be upgraded – RAM, hard drive, video, CPU – and how far it can be upgraded.
• WiFi Hardware Compatible with Desktop Macs Running OS X, MetaPhyzx, Mac Daniel, 2009.03.11. USB, ethernet, PCI, and other wireless hardware compatible with Mac OS X.
• WiFi Adapters for Desktop Macs Running Mac OS 9, MetaPhyzx, Mac Daniel, 2009.02.10. USB, ethernet, PCI, and other wireless hardware compatible with the Classic Mac OS.
• The Future of Up-to-Date Browsers for PowerPC Macs, Charles W Moore, Miscellaneous Ramblings, 2009.08.31. With Intel-only “Snow Leopard” shipping, software support for PPC Macs will continue its decline. Also, a look at SeaMonkey 2 and Camino 1.6.9.
• Optimized Software Builds Bring Out the Best in Your Mac, Dan Knight, Low End Mac’s Online Tech Journal, 2009.06.30. Applications compiled for your Mac’s CPU can load more quickly and run faster than ones compiled for universal use.
• Tips for Installing or Reinstalling Mac OS X 10.4 Tiger, Adam Rosen, Adam’s Apple, 2009.06.10. Mac OS X 10.4 uses less memory than Leopard, supports Classic Mode on PowerPC Macs, and, unlike Leopard, is supported on G3 Macs.
• Odd MacBook sleep behavior, Pismo resurrection and upgrades, end nigh for Classic Eudora? and more, Charles W Moore, Miscellaneous Ramblings, 2009.05.27. Also the end of the road for Lombard and G4 iMac CPU upgrades.
• Hacking a WiFi PC Card to work in Apple’s AirPort Card slot, Simon Royal, Tech Spectrum, 2009.04.21. Apple’s AirPort Card has become expensive since it was discontinued. Here’s how you may be able to adapt an 802.11b PC Card to replace it.
• Is Leopard Slower than Tiger on G4 Macs?, Simon Royal, Tech Spectrum, 2009.04.17. Truth be told, when you have 1 GB of RAM, Leopard benchmarks an insigificant 4% slower than Tiger.
• Is It Worth Maxing the RAM in Old G3 and G4 Macs?, Simon Royal, Tech Spectrum, 2009.04.15. Increasing memory can make your old Mac faster and make you more productive, but it probably won’t improve resale value by the amount you spend.
• Golden Apples: The 25 best Macs to date, Michelle Klein-Häss, Geek Speak, 2009.01.27. The best Macs from 1984 through 2009, including a couple that aren’t technically Macs.
• Is Camino now the best browser for older Macs?, Charles W Moore, Miscellaneous Ramblings, 2009.01.13. Camino 1.6.6 works very will with Mac OS X 10.3 through 10.5 and seems especially well suited for slower PowerPC Macs.
• The ‘Better Safe Than Sorry’ Guide to Installing Mac OS X Updates, Charles W Moore, Miscellaneous Ramblings, 2008.12.16. Most users encounter no problems using Software Update, but some preflight work and using the Combo updater means far less chance of trouble.
• Leopard on an 867 MHz G4 trounces Vista on a 2 GHz Core Duo notebook, Simon Royal, Tech Spectrum, 2008.12.16. Apple makes sure that each version of OS X runs well on the minimum supported hardware, while PCs well above minimum spec struggle under Microsoft’s latest version of Windows.
• Why You Should Partition Your Mac’s Hard Drive, Dan Knight, Mac Musings, 2008.12.11. “At the very least, it makes sense to have a second partition with a bootable version of the Mac OS, so if you have problems with your work partition, you can boot from the ’emergency’ partition to run Disk Utility and other diagnostics.”
• Leopard runs very nicely on PowerPC Macs, Simon Royal, Tech Spectrum, 2008.11.19. Some claim that Mac OS X 10.5 is so optimized for Intel Macs that it runs poorly on PowerPC hardware. That’s simply not the case.
• Every working computer is useful to someone, Allison Payne, The Budget Mac, 2008.11.19. Whether it’s a PowerBook 1400, G3 iMac, or Power Mac G4, it could be all the computer someone needs.
• How to clone Mac OS X to a new hard drive, Simon Royal, Tech Spectrum, 2008.10.07. Whether you want to put a bigger, faster drive in your Mac or clone OS X for use in another Mac, here’s the simple process.
• 9 browsers for G3 and older G4 Macs compared, Simon Royal, Tech Spectrum, 2008.09.26. The latest versions of Opera, Safari, Shiira, iCab, Radon, Firefox, Demeter, Sunrise, and Camino that run on Mac OS X 10.4 “Tiger”.
• Does running OS X system maintenance routines really do any good?, Charles W Moore, Miscellaneous Ramblings, 2008.08.26. Mac OS X is designed to run certain maintenance routines daily, weekly, and monthly – but can’t if your Mac is off or asleep.
• PCs not like Macs, Claris Home Page fan, iMac G4 upgrade tips, iBook prices, and more, Dan Knight, Low End Mac Mailbag, 2008.08.18. Also using PC3200 RAM in a Mirrored Drive Doors G4, cloning the classic Mac OS to a new hard drive, and thoughts on a Windows App Store.
• Unreliable Macs, future Apple CPUs, replacing a Mac Plus mouse, and more, Dan Knight, Low End Mac Mailbag, 2008.08.12. Also Windows Media Player content that doesn’t work on Macs, Leopard on a 700 MHz iMac G4, Apple’s $99 Pro Care service, and CPU options.
• The Compressed Air Keyboard Repair, Charles W Moore, Miscellaneous Ramblings, 2008.07.24. If your keyboard isn’t working as well as it once did, blasting under the keys with compressed air may be the cure.
• How to upgrade your eMac without cracking the case, Jason Packer, Macs in the Enterprise, 2008.07.14. Some people like to replace the components inside their computers, but with FireWire and USB 2.0, Apple has made it easy to upgrade using external drives.
• Turn your old Mac into a web server with Linux, Apache, MySQL, and PHP, Jason Packer, Macs in the Enterprise, 2008.07.09. Step-by-step instructions for installing and configuring Linux, Apache, MySQL, and PHP on an older Mac.
• SheepShaver brings Classic Mac OS to Intel Macs and Leopard, Alan Zisman, Mac2Windows, 2008.05.20. Mac OS X 10.5 doesn’t support Classic Mode. Neither does Leopard. But SheepShaver lets you emulate a PowerPC Mac and run the Classic Mac OS.
• Leopard is the way to go, even on most old G4 Macs, Carl Nygren, My Turn, 2008.05.14. The useful and just cool features in Mac OS X 10.5 make this the biggest step forward in the history of the Mac OS.
• 10 cult Macs adored by collectors, Tamara Keel, Digital Fossils, 2008.05.13. Macs are not only noted for their longevity, but also by the passion which collectors have for some of the most interesting models ever made.
• Safari 3.1 will be ‘crazy fast’, OS X 10.5.2 update, 20x SuperDrive from $35, and more, Mac News Review, 2008.02.15. Also Security Update for Tiger, Graphics Update for Leopard, Mac mini “as powerful as a larger desktop”, TechTool Deluxe update, and more.
• Leopard problems with GeForce graphics, on eMacs and Power Macs, and more, Dan Knight, Low End Mac Mailbag, 2007.11.14. More success running Mac OS X 10.5 on iMacs, eMacs, Power Macs, and PowerBooks. Also failures with a Cube and a Blue and White G3 with a G4 upgrade.
• Leopard with 384 MB RAM, on a PowerBook G4/550, benchmarked, and more, Dan Knight, Low End Mac Mailbag, 2007.11.06. Leopard on Digital Audio, Quicksilver, and Sawtooth Power Macs. Questions on CPU load in OS X 10.5 and whether beige G3s and PCI Power Macs might run it.
• Unsupported Leopard installation, Dan Knight, 2007.10.31. How to install Mac OS X 10.5 on unsupported hardware – plus field reports.
• Happy with my G3s, plus Leopard on eMacs, G4 iMacs, G4 PowerBooks, and the G4 iBook, Dan Knight, Low End Mac Mailbag, 2007.11.02. A reminder of the happiness found sticking with older versions of the Mac OS on G3 Macs, plus field reports of Leopard running on even more unsupported G4 Macs.
• eMac virtual screen solution, PowerBook 3400 problem, IBM Model M and the Mac, and more, Dan Knight, Low End Mac Mailbag, 2007.10.26. Also G4 iMacs inspire lust, TrueType fonts and vintage Macs, deinterlacing DVDs, and Allegro USB sleep issues.
• Unsupported Leopard installation and the truth about Leopard DVD Player system requirements, Dan Knight, Low End Mac Mailbag, 2007.10.25. How to create a hacked Leopard installer, and exactly what benefit you gain from a 1.6 GHz CPU with DVD Player under Leopard.
• G4 iMac ‘not half anything’, LEM design comments, and more on Macs not supported by Leopard, Dan Knight, Low End Mac Mailbag, 2007.10.22. The dual 800 MHz Power Mac may be supported, Apple is (or isn’t) right to draw the line at 867 MHz, and an LC III that won’t work with a PC display.
• Software to darken iMac display, columnist returns iPhone, Logitech introduces air mouse, and more, Mac News Review, 2007.07.20. Also a USB turntable for turning your record albums into MP3s, a retractable flash drive, iPhone: The Missing Manual, Parallels Desktop 3 a major update, and more.
• 11 No Cost Tips for Optimizing Mac OS X 10.4 Tiger Performance, Ed Eubanks Jr, The Efficient Mac User, 2007.03.12. If your Mac is getting sluggish, here are 11 tips that can help restore its original performance.
• Using FireWire Target Disk Mode to install OS X on Macs without DVD drives, Charles W Moore, Miscellaneous Ramblings, 2006.09.14. Two methods for using FireWire Target Disk mode to install OS X on a Mac that can’t read DVDs.
• Customizing Mac OS 9, Nathan Thompson, Embracing Obsolescence, 2006.08.01. Fiddling with themes, picking a browser, and making the Classic Mac OS work just the way you want it to.
• End of G4 models points to unprecedented value for used G4 Macs, Leaman Crews, Plays Well with Others, 2006.06.02. The PowerPC G4 may no longer have a place in Apple’s product line, but that’s a far cry from saying G4-based Macs are obsolete. If anything, their value is going to increase.
• Making the move from Jaguar (OS X 10.2) to Panther (10.3), Ted Hodges, Vintage Mac Living, 2006.04.11. One advantage of Apple’s “no upgrades” policy for OS X – someone can give you their old copy after upgrading without worrying about violating their license.
• Web browser tips for the classic Mac OS, Nathan Thompson, Embracing Obsolescence, 2006.01.03. Tips on getting the most out of WaMCom, Mozilla, Internet Explorer, iCab, Opera, and WannaBe using the classic Mac OS.
• The best browsers for PowerPC Macs and the classic Mac OS, Nathan Thompson, Embracing Obsolescence, 2005.12.16. Two browsers stand out from the pack: iCab 3 is modern and remains under development, and WaMCom brings Mozilla to older Macs.
• The iMac List, an email list iMac users

Keywords: #imacg4 #15inchimac

Short link: http://goo.gl/VpGZCD

Choose your iMac model

If you're not sure which iMac you have, you can identify your iMac and then select it from the list below.

27-inch

24-inch

21.5-inch

• iMac (Retina 4K, 21.5-inch, 2019)*
• iMac (Retina 4K, 21.5-inch, 2017)*
• iMac (21.5-inch, 2017)*
• iMac (21.5 inch, Mid 2014)*
• iMac (21.5-inch, Late 2013)*
• iMac (21.5-inch, Late 2012)*

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20-inch

17-inch

* Memory is not removable by users on iMac (21.5-inch, Late 2012), iMac (21.5-inch, Late 2013), iMac (21.5-inch, Mid 2014), iMac (21.5-inch, 2017), iMac (Retina 4K, 21.5-inch, 2017), and iMac (Retina 4K, 21.5-inch, 2019). If the memory in one of these computers needs repair service, contact an Apple Retail Store or Apple Authorized Service Provider. If you’d like to upgrade the memory in one of these models, an Apple Authorized Service Provider can help. Before you schedule an appointment, confirm that the specific Apple Authorized Service Provider offers memory upgrade services.

Memory in iMac (21.5-inch, Late 2015), and iMac (Retina 4K, 21.5-inch, Late 2015) is not upgradeable.

iMac (Retina 5K, 27-inch, 2020)

Get memory specifications for iMac (Retina 5K, 27-inch, 2020), then learn how to install memory in this model.

Memory specifications

This iMac model features Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

For optimal memory performance, DIMMs should be the same capacity, speed, and vendor. Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

• PC4-21333
• Unbuffered
• Nonparity
• 260-pin
• 2666MHz DDR4 SDRAM

If you have mixed capacity DIMMs, see the install memory section for installation recommendations.

iMac (Retina 5K, 27-inch, 2019)

Get memory specifications for iMac (Retina 5K, 27-inch, 2019), then learn how to install memory in this model.

Memory specifications

This iMac model features Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

• PC4-21333
• Unbuffered
• Nonparity
• 260-pin
• 2666MHz DDR4 SDRAM

iMac (Retina 5K, 27-inch, 2017)

Get memory specifications for iMac (Retina 5K, 27-inch, 2017), then learn how to install memory in this model.

Memory specifications

This iMac model features Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

• PC4-2400 (19200)
• Unbuffered
• Nonparity
• 260-pin
• 2400MHz DDR4 SDRAM

iMac (Retina 5K, 27-inch, Late 2015)

Get memory specifications for iMac (Retina 5K, 27-inch, Late 2015), then learn how to install memory in this model.

Memory specifications

This iMac model features Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

• PC3-14900
• Unbuffered
• Nonparity
• 204-pin
• 1867MHz DDR3 SDRAM

For these 27-inch models

Get memory specifications for the following iMac models, then learn how to install memory in them:

• iMac (Retina 5K, 27-inch, Mid 2015)
• iMac (Retina 5K, 27-inch, Late 2014)
• iMac (27-inch, Late 2013)
• iMac (27-inch, Late 2012)

Memory specifications

These iMac models feature Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

• PC3-12800
• Unbuffered
• Nonparity
• 204-pin
• 1600MHz DDR3 SDRAM

Installing memory

The internal components of your iMac can be warm. If you've been using your iMac, wait ten minutes after shutting it down to let the internal components cool.

After you shut down your iMac and give it time to cool, follow these steps:

1. Disconnect the power cord and all other cables from your computer.
2. Place a soft, clean towel or cloth on the desk or other flat surface to prevent scratching the display.
3. Hold the sides of the computer and slowly lay the computer face-down on the towel or cloth.
4. Open the memory compartment door by pressing the small grey button located just above the AC power port:
5. The memory compartment door will open as the button is pushed in. Remove the compartment door and set it aside:
6. A diagram on the underside of the compartment door shows the memory cage levers and the orientation of the DIMM. Locate the two levers on the right and left sides of the memory cage. Push the two levers outward to release the memory cage:
7. After the memory cage is released, pull the memory cage levers toward you, allowing access to each DIMM slot.
8. Remove a DIMM by pulling the module straight up and out. Note the location of the notch on the bottom of the DIMM. When reinstalling DIMMs, the notch must be oriented correctly or the DIMM won't fully insert:
9. Replace or install a DIMM by setting it down into the slot and pressing firmly until you feel the DIMM click into the slot. When you insert a DIMM, make sure to align the notch on the DIMM to the DIMM slot. Find your model below for specific installation instructions and notch locations:
   • iMac (Retina 5K, 27-inch, 2020) DIMMs have a notch on the bottom, slightly left of the middle. If your DIMMs are mixed in capacity, minimize the capacity difference between Channel A (slots 1 and 2) and Channel B (slots 3 and 4) when possible.
     
   • iMac (Retina 5K, 27-inch, 2019) DIMMs have a notch on the bottom, slightly left of the middle:
   • iMac (27-inch, Late 2012) and iMac (Retina 5K, 27-inch, 2017) DIMMs have a notch on the bottom left:
     
   • iMac (27-inch, Late 2013) and iMac (Retina 5K, 27-inch, Late 2014, Mid 2015, and Late 2015) DIMMs have a notch on the bottom right:
     
10. After you install all of your DIMMs, push both memory cage levers back into the housing until they lock into place:
    
11. Replace the memory compartment door. You don't need to press the compartment door release button when replacing the compartment door.
12. Place the computer in its upright position. Reconnect the power cord and all other cables to the computer, then start up the computer.
    

Your iMac performs a memory initialization procedure when you first turn it on after upgrading memory or rearranging DIMMs. This process can take 30 seconds or more, and the display of your iMac remains dark until it's finished. Make sure to let the memory initialization complete.

For these 27-inch and 21.5-inch models

Get memory specifications for the following iMac models, then learn how to install memory in them:

• iMac (27-inch, Mid 2011)
• iMac (21.5-inch, Mid 2011)
• iMac (27-inch, Mid 2010)
• iMac (21.5-inch, Mid 2010)
• iMac (27-inch, Late 2009)
• iMac (21.5-inch, Late 2009)

Memory specifications

Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

i5 and i7 Quad Core iMac computers come with both top memory slots populated. These computers will not start up if only a single DIMM is installed in any bottom slot; these computers should operate normally with a single DIMM installed in any top slot.

Core Duo iMac computers should operate normally with a single DIMM installed in any slot, top or bottom. ('Top' and 'bottom' slots refer to the orientation of the slots in the pictures below. 'Top' refers to the slots closest to the display; 'bottom' refers to the slots closest to the stand.)

Installing memory

The internal components of your iMac can be warm. If you've been using your iMac, wait ten minutes after shutting it down to let the internal components cool.

After you shut down your iMac and give it time to cool, follow these steps:

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1. Disconnect the power cord and all other cables from your computer.
2. Place a soft, clean towel or cloth on the desk or other flat surface to prevent scratching the display.
3. Hold the sides of the computer and slowly lay the computer face-down on the towel or cloth.
4. Using a Philips screwdriver, remove the RAM access door in the bottom of your computer:
   
5. Remove the access door and set it aside.
6. Untuck the tab in the memory compartment. If you're replacing a memory module, gently pull the tab to eject any installed memory module:
   
7. Insert your new or replacement SO-DIMM into the empty slot, noting the orientation of the keyway of the SO-DIMM as shown below.
8. After you insert it, press the DIMM up into the slot. There should be a slight click when you seat the memory correctly:
   
9. Tuck the tabs above the memory DIMMs, and reinstall the memory access door:
   
10. Place the computer in its upright position. Reconnect the power cord and all other cables to the computer, then start up the computer.

For these 24-inch and 20-inch models

Get memory specifications for the following iMac models, then learn how to install memory in them:

• iMac (24-inch, Early 2009)
• iMac (20-inch, Early 2009)
• iMac (24-inch, Early 2008)
• iMac (20-inch, Early 2008)
• iMac (24-inch Mid 2007)
• iMac (20-inch, Mid 2007)

Memory specifications

These iMac computers have two side-by-side Synchronous Dynamic Random-Access Memory (SDRAM) slots in the bottom of the computer.

The maximum amount of random-access memory (RAM) you can install in each computer is:

You can use a 1GB or 2GB RAM module in each slot for iMac (Mid 2007) and iMac (Early 2008). Use 1GB, 2GB, or 4GB modules in each slot for the iMac (Early 2009).

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Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

DIMMs with any of the following features aren't supported:

• Registers or buffers
• PLLs
• Error-correcting code (ECC)
• Parity
• Extended data out (EDO) RAM

Installing memory

The internal components of your iMac can be warm. If you've been using your iMac, wait ten minutes after shutting it down to let the internal components cool.

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After your iMac cools down, follow these steps:

1. Disconnect the power cord and all other cables from your computer.
2. Place a soft, clean towel or cloth on the desk or other flat surface to prevent scratching the display.
3. Hold the sides of the computer and slowly lay the computer face-down on the towel or cloth.
4. Using a Philips screwdriver, remove the RAM access door in the bottom of the computer:
   
5. Remove the access door and set it aside.
6. Untuck the tab in the memory compartment. If you're replacing a memory module, untuck the tab and pull it to eject any installed memory module:
   
7. Insert your new or replacement RAM SO-DIMM into the empty slot, noting the orientation of the keyway of the SO-DIMM as shown above.
8. After you insert it, press the DIMM up into the slot. There should be a slight click when you seat the memory correctly.
9. Tuck the tabs above the memory DIMMs, and reinstall the memory access door:
   
10. Place the computer in its upright position. Reconnect the power cord and all other cables to the computer, then start up the computer.

For these 20-inch and 17-inch models

Get memory specifications for the following iMac models, then learn how to install memory in them:

• iMac (20-inch Late 2006)
• iMac (17-inch, Late 2006 CD)
• iMac (17-inch, Late 2006)
• iMac (17-inch, Mid 2006)
• iMac (20-inch, Early 2006)
• iMac (17-inch, Early 2006)

Memory specifications

For best performance, fill both memory slots, installing an equal memory module in each slot.
*iMac (Late 2006) uses a maximum of 3 GB of RAM.

Installing memory in the bottom slot

The internal components of your iMac can be warm. If you've been using your iMac, wait ten minutes after shutting it down to let the internal components cool.

After you shut down your iMac and give it time to cool, follow these steps:

1. Disconnect the power cord and all other cables from your computer.
2. Place a soft, clean towel or cloth on the desk or other flat surface to prevent scratching the display.
3. Hold the sides of the computer and slowly lay the computer face-down on the towel or cloth.
4. Using a Phillips screwdriver, remove the RAM access door on the bottom of the iMac and set it aside:
   
5. Move the DIMM ejector clips to their fully open position:
   
6. Insert your RAM SO-DIMM into the bottom slot, keeping in mind the orientation of the keyed SO-DIMM:
   
7. After you insert it, press the DIMM up into the slot with your thumbs. Don't use the DIMM ejector clips to push in the DIMM, as this might damage the SDRAM DIMM. There should be a slight click when you seat the memory fully.
8. Close the ejector clips:
   
9. Reinstall the memory access door:
   
10. Place the computer in its upright position. Reconnect the power cord and all other cables to the computer, then start up the computer.

Replacing memory in the top slot

After you shut down your iMac and give it time to cool, follow these steps:

1. Disconnect the power cord and all other cables from your computer.
2. Place a soft, clean towel or cloth on the desk or other flat surface to prevent scratching the display.
3. Hold the sides of the computer and slowly lay the computer face-down on the towel or cloth.
4. Using a Phillips screwdriver, remove the RAM access door on the bottom of the iMac and set it aside:
   
5. Pull the two levers on each side of the memory compartment to eject the memory module that's already installed:
   
6. Remove the memory module from your iMac as shown below:
   
7. Insert your RAM SO-DIMM into the top slot, noting the orientation of the keyed SO-DIMM:
   
8. After you insert it, press the DIMM up into the slot with your thumbs. Don't use the DIMM ejector clips to push in the DIMM, as this might damage the SDRAM DIMM. There should be a slight click when you seat the memory fully.
9. Close the ejector clips:
   
10. Reinstall the memory access door:
    
11. Place the computer in its upright position. Reconnect the power cord and all other cables to the computer, then start up the computer.

If your iMac makes a tone after you install memory

iMac models introduced before 2017 might make a warning sound when you start up after installing or replacing memory:

• One tone, repeating every five seconds signals that no RAM is installed.
• Three successive tones, then a five-second pause (repeating) signals that RAM doesn't pass a data integrity check.

If you hear these tones, confirm that the memory you installed is compatible with your iMac and that it's installed correctly by reseating the memory. If your Mac continues to make the tone, contact Apple Support.

Confirm that your iMac recognizes its new memory

After you install memory, you should confirm that your iMac recognizes the new RAM by choosing Apple () menu > About This Mac.

The window that appears lists the total memory, including the amount of memory that originally came with the computer plus the newly added memory. If all the memory in the iMac has been replaced, it lists the new total of all installed RAM.

For detailed information about the memory installed in your iMac, click System Report. Then choose Memory under the Hardware section in the left side of System Information.

If your computer doesn't recognize the memory or doesn't start up correctly, confirm that the RAM you installed is compatible with your iMac and that it's installed correctly by reseating the memory. If you continue to have issues with the memory in your iMac, contact Apple Support.