Brendan Halpin wrote:
> I've got a machine that is hanging or rebooting at random
> intervals, and am trying to determine whether it is a hardware
> problem. My puzzle of the moment is why memtest gives me errors if
> I boot off a Knoppix CD, but not if I boot from a memtest CD. Could
> it be the environment, or the version of memtest (2.9 under
> Knoppix, 3.1 on its own disc)?
I'd suggest obtaining a copy of Ubuntu (for example) and running the
memtest utility that comes with that, to rule out error with one version
of memtest86 as against another (assuming versions/environment are
different and affect the test).
Though, I'd think (not having detailed knowledge of the semantics of
memtest86) , that a RAM failure result, on a reasonably up to date
memtest86 trial, is a /bad/ sign and that perhaps RAM bugs of this
nature are non deterministic. A BIOS bug for example, perhaps not
initialising RAM refresh rates correctly on each and every boot, under
some weird circumstances  might explain why one test fails, while
another test comes up clean.
If in doubt, grab a tech support person and demand to speak to their
managers, until replacement hardware is sent to you.... and next time...
don't use the CDROM as a coffee holder !
 Perhaps try a BIOS flash for the motherboard if available.
"Fiery the angels fell. Deep thunder rolled around their shores, burning
with the fires of Orc." -- Roy Batty, Blade Runner.
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