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There are no troubleshooting guides for the iMac 20" Model A1145 at this time.


You can cost-effectively upgrade a number of components in the iMac 20" Model A1145.

  • Memory: If your iMac is still running with only the stock RAM, upgrading with 2 GB of RAM will provide a dramatic performance boost at minimal cost.
  • Hard Drive: 250 or 500 GB hard drives came standard with the iMac 20" Model A1145. You can upgrade the drive up to 2 TB.
  • Optical Drive: The optical drive can easily be upgraded to an 8x SuperDrive.

Identification and Background

You can verify that you have a iMac 20" Model A1145 by checking the processor information through "About This Mac" in the Apple menu.

Use the iMac identification system to help you identify your machine. iMacs tend to look very similar, and it's important to know which machine you have before ordering any replacement parts.

The iMac G5 was a series of desktop Macintosh computers designed and built by Apple Inc. using the PowerPC chip architecture. It was the last line of iMac computers that used a PowerPC chip, making it the last of the iMacs that could run Mac OS (Classic) applications.

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