HT1939: Resetting PMU on Power Mac G5, Power Mac G4, Power Macintosh G3
Learn about Resetting PMU on Power Mac G5, Power Mac G4, Power Macintosh G3
Q: power light is on but computer won't turn on
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Jun 11, 2013 10:31 AMby BDAqua,Might be time to replace the PRAM Battery, 4 years is close to their lifespan, far less if ever without AC power, & can cause strange startup problems...
See which one your G5 has...
http://eshop.macsales.com/item/Newer%20Technology/CR2032/
http://eshop.macsales.com/item/Newer%20Technology/BAA36VPRAM/
How to reset the SMU/PMU on a Power Mac G5 (Late 2004) or Power Mac G5 (Late 2005) ...
http://support.apple.com/kb/HT1436
Earlier G3, G4, G5 models...
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Jun 11, 2013 3:55 PMby Texas Mac Man,Troubleshooting: My computer won't turn on
http://support.apple.com/kb/TS1367
Resetting the Logic Board
Resetting the logic board can resolve many system problems. Whenever you have a
unit that fails to power up, you should follow this procedure
before replacing any modules.
1 Unplug the computer.
2 Press the Power On button on the front of the unit.
3 Open the side access panel.
4 Remove the battery from the logic board.
5 Wait at least 10 minutes before replacing the battery.
6 Make sure the battery is installed in the correct +/-
direction.
7 Reassemble the computer and test the unit.
Cheers, Tom
