[G4] Power Supply Problem

[Joel Threatt]

On Feb 6, 2005, at 10:17 AM, Joel Threatt 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
>
The computer works well with the firewire drive but now it has started 
to not read CD's. CDRs, commercial disks, nuttin. Another question I 
have is, would using a third party IDE Controller in place of the built 
in controller function.  This problem seems to be centered around the 
on board IDE controller.   Any thoughts.
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