[G4] Dual 1.25 MDD G4 won't boot OS X. Any ideas?

[Mark Steele]

This is a dual 1.25GHz MDD G4 (I think it has FW800, not sure, how to
tell???)
1.25 Gigs RAM.
Couple of HDs and two internal optical drives.

Problem: When booting into OS X (10.5.x) the machine locks up at the grey
screen with the Apple logo.
Booting into the Hardware test disk (supplied with the machine) works fine
and all tests pass, even letting
it loop overnight.
Booting, installing and running linux does work (but can be somewhat flakey)
The ones I've tried are
Fedora 7(?), some version of Ubuntu (which doesn't seem to be supported with
the latest version so
it is probably one back from that).

I've re-arraged the RAM chips (using the same slots as before) and the
problem still exists. Any attempts
to boot into OS X fails. This machine has had the same hardware for several
years and booted and worked
just fine, then one day it just locked up and wouldn't boot again.

Any ideas on what to try next??
Thanks,
-Mark
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