G5 won't turn on.

[JAW]

My G5 won't turn on, the power light goes on and then just dims. Anything too try?

 

[Black Morty Rackham]

Take it apart and remove all the dust.

 

[ShimmyT]

It might be that it's asleep. Try pressing and holding the power button for about 15 seconds. Or be positive it's off and unplug it.

 

[Galvatron]

Find the little button on the logic board that resets the PMU. Press it once, it should come right back up. If not, you may be looking for a new power supply.

 

[JAW]

Find the little button on the logic board that resets the PMU.

Could you elaborate on this? What exactly would I be looking for?

 

[ShimmyT]

Reset the SMU: http://docs.info.apple.com/article.html?artnum=300341
Reset the P-Ram: pram reset

 

[JAW]

btw its a powermac g5, not an imac. was purchased about little over a year ago.

 

[fossill]

I work at a university and we get this sometimes with the older G4 powermacs. I'd take the ram out, reseat it, unplug the Powersupply from the logic board, and remove the backup battery. Usually after this, and leaving them sit for a while, (few hours to a few days), they usually come back to life. I know dumb solution, but it works.

 

[fossill]

and I meant to leave the mainboard completely powerless while it sits. Not just unplugging it and plugging it back in. also, if not obvious make sure the PS is unplugged from the wall while your are doing all this.