[G4] Power Supply Problem

[Valerie Maples]

There was no suspicion of the RAM until I sold it and the machine it went in
experienced problems "seeing the HD" and then quit spinning/ loading.  Sent
in RAM, it was tested and replaced, and worked in the second machine.
Previously Apple had replaced 2 HD, 2 optical drives and 2 logic boards
before replacing the machine.  Theory now is that the RAM caused logic board
problems which caused component failure.

Valerie


On 2/7/05 4:18 AM, "Joel Threatt" <jthreatt at nc.rr.com> wrote:

> Interesting, what other symptoms, if any,  did you have relating to the
> ram? I have been using the machine from the firewire drive since I
> realized it would work during testing? And what software would you
> recommend to diagnose the ram?
> 
> Joel
> On Feb 7, 2005, at 1:45 AM, Valerie Maples wrote:
> 
>> I burned out 2 motherboards on a Quicksilver due to faulty RAM which
>> we did
>> not figure out until after Apple swapped us for a new G5; shucks!  ;-)
>> 
>> Check any non- Apple RAM; it has been known to be problematic.
>> 
>> 
>> Valerie Maples
>> 
>> Macintosh Dual 2 GHz Power PC G5
>> 1 GB DDR SDRAM
>> 160 GB HD
>> System OS X 10.3.7
>> 
>> On 2/6/05 12:36 PM, "Paul Frye" <paulfrye at mac.com> wrote:
>> 
>>> 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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