Powermac G5 Fix

Capacitors and other electronic parts occasionally short out, along with dust amongst other parts of the machine causing a short.

Likely if you had a simple volt/resistance meter, there would likely be a simple test for checking out the power supply... Looking at voltage, and for a closed circuit across a couple pins. What are good values for the supply and where to find them, have no idea.

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Likely, you'd want to pull the HD, and do any further testing with it out of the machine ... just to make sure a problem doesn't kill that. Can always boot from the CD drive.

 

Could be the PSU, might just be the fuse in the PSU. There are instructions out there on these PSUs. I believe you can hack a PC PSU in if you don't need the ADC port power.

 

the problem is the firewire port is most likely broken,

motherboards/logic boards have fuses on them that the bios/smc/pmu can check for all usb/firewire ports,

if this fuse is tripped it WILL NOT start, you must unplug the firewire cable from the logic board, your computer should then restart.

 

I've heard of this problem in the G5s. I remember it being the front power button board. It would "spark" every time you pressed the button as there was a short to the aluminum casing or something similar. Since you did say you removed the firewire from the front, it's all connected to the same board so you possibly shorted something out from the movement.

Could just be a $10 fix compared to $100, also a lot easier as the removal of the G5 power supply can be difficult for some people.