The Power Mac G5 Repair Extension Program for Power Supply Issues applies to Power Mac G5 systems that have power-related issues as a result of a specific component failure within the computer’s power supply. If your Power Mac G5 fails to start up after the power button has been pressed and your computer’s serial number is within the noted ranges, your computer may be eligible for repair, free of charge. There are no known safety issues caused by this component failure.
The affected Power Mac G5 models were sold between approximately October 2005 and August 2006 and feature Dual 2GHz, Dual 2.3GHz or Quad 2.5GHz PowerPC G5 processors.
If Apple or an Apple Authorized Service Provider (AASP) determines that your Power Mac G5 computer is eligible as part of the program, the power supply repair will be covered by Apple for up to two years from the original date of purchase even if your Power Mac G5 is out of warranty. This worldwide Apple program does not extend the standard warranty coverage of the Power Mac G5.
Affected systems will exhibit one of the following power-related symptoms:
• System will not start up after the power button is pressed
• No LED activity
Note: If your Power Mac G5 is not experiencing any of these symptoms, you do not have to contact Apple or any Apple Authorized Service Provider.
The affected Power Mac G5 computers have serial numbers where the first 5 digits fall into the ranges noted below. The Power Mac G5 computer’s serial number is located inside the case directly below the air deflector, along with other configuration information.
Serial Number Ranges:
• CK539xxxxxx – CK608xxxxxx
• G8539xxxxxx – G8608xxxxxx
• YM539xxxxxx – YM608xxxxxx
• RM539xxxxxx – RM608xxxxxx
More info here.