[G4] Power Supply Problem

[Paul Frye]

Based on your analysis it points straight back to the motherboard.  These
are typically very reliable machines.  I would suggest swapping out the
motherboard one more time.  Hopefully you got a warranty on it.

Regards,

Paul

On 2/6/05 7:17 AM, "Joel Threatt" <jthreatt at nc.rr.com> wrote:

> I have a Quick Silver '02  dual 1gig, currently at 867 due to a dead
> processor. I recently had some issues with the drives not spinning up.
> My constant on/off/pram resets pretty much finished the logic board as
> well. First I sent the PS to a Mac repairer for the "free" diagnoses. I
> was told the PS was fine so then I sent in the logic board and after
> calling them they said the board was dead and it couldn't be repaired.
> OK so of course they could replace the board so I did that. A few days
> later I reassembled my QS and it booted and ran fine, much to my
> relief. After about 5-6 hrs the drives again spun down. Being careful
> only to do ONE pram reset I proceeded to change cables, change drives,
> try one at a time. nothing worked. All those drives spun up fine in my
> one firewire enclosure. A check of the voltages at the plugs showed
> 4.75v and 9.6v respectively. I tried this with drives connected and
> disconnected. Curiously enough my internal CDRW runs fine while my hard
> drives will not spin at all when connected to the PS. Although they
> work fine in the Firewire. I own a lot of Macs starting with a Color
> Classic II and had no problems like this occur. This is my first G4 and
> all this trouble is driving me back towards a PC.   Oh I also checked
> the battery and it was at 1.2v so it got replaced first thing. Has this
> happened to anyone else? I figure I am looking at a new PS. Or could
> the new board have failed like the original? Your thoughts will be
> greatly appreciated
> 
> Joel
> 
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