on 12/6/04 9:59 AM, Jay Winter at [EMAIL PROTECTED]
wrote:
> HELP!!!
> I'm trying to upgrade a Beige G3/300 (Rev B/3) Minitower
> for my daughter in time for Christmas. I had everything
> working fine... OS 9.21 was installed, and I was working
on
> re-routing the cables for the new hard drive (which had
> been working fine), and suddenly it will not boot.
>
> 1. The hard drive starts to spin-up, then stops.
> 2. If I disconnect the cable from the hard drive, it
spins
> up okay. Same symptoms with another known good drive.
> Tried many other cables to no avail.
> 3. Can't boot from CD either -- same symptoms with CDROM
> drive as with hard drive.
> 4. No video display at all. Nada; zilch; black screen.
> 5. Tried swapping out the power supply with a new ATX
> supply I had on hand.... NO CHange in symptoms.
> 6. Had a NEW rev-B motherboard on hand, so I swapped it;
> reinstalled everything... NO Change in symptoms.
> 7. Only things I have NOT swapped out are the CPU and
the
> VRM. Don't have replacements for either on hand, but
I've
> ordered a new VRM. Could that be the problem?
>
Thanks to All, but the problem is solved. Thanks to a tip
I found on the MacUser forum.
The resurrection process is as follows:
1. Remove the CPU, all PCI cards, and (to minimize the
number of variables) all but one memory DIMM.
2. Disconnect any hard drive cables.
3. Power up the machine. You may or may not hear three
beeps from the speaker.
4. Power down and reinstall everything.
5. Power up again, and the machine should boot normally.
Apparently this "dead motherboard" syndrome affects systems
with higher-than-the-original-clock-speed CPUs, and this
process forces the system ROM to recalibrate the speed of
the installed CPU.
Cheers!
-Jay
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