Apple Computer has initiated a free repair extension program for certain Power Mac G5 models that fail to start up after the power button has been pressed. Affected computers may also fail to show any LED activity.
Systems that are eligible for no-cost repair fall in these serial number ranges:
G8539xxxxxx - G8608xxxxxx
YM539xxxxxx - YM608xxxxxx
RM539xxxxxx - RM608xxxxxx
You can find the serial number by removing your Macis side access panel and looking near the bottom of the case below the air deflector.
Serial number location on the Power Mac G5.
Additional information about the power supply repair program is available on Appleis Support Web site.