Chris wrote:

Hi,

I was curious if anyone has information on repairing a power supply for
a PowerMac G4 733 (Quicksilver). I believe the supply has an issue as it
won't start up the machine, but it spins the fans for a few seconds before
shutting down. Any suggestions or information would be appreciated as the
replacement is quite costly!

Thanks,
Chris


I had a Blue G3 machine which had a blown supply the form factor was
identical to an ATX. It had a blown main power FET which had a rating
IIRC of 700 Volts 10 Amps. I replaced with one that was 600 Volts 5 Amps
and it ran. The only other thing to bear in mind is that the wiring is
the same as an ATX however one of the supply voltages wasn't necessary ,
maybe -5V or -12V.

This site had quite a bit of info

http://www.xlr8yourmac.com/

Andrew