It would appear from your description that the machine isn't even making it
past the POST (power on self test), and you have no display at all on the
screen.  If so, you may want to remove the processor from its socket and
reinstall it if you feel comfortable doing so.  I have seen several machines
with failing motherboards exhibit this problem (right down to shutting down
on their own overnight),  and often reinserting the processor revives the
machine temporarily.  Ultimately the solution was to replace the motherboard
in each instance, after which all was well.

The operating system on the hard drive may not load properly on a different
machine due to chipset and/or hardware differences between the two machines;
if the differences are great enough the os typically will not even load.

Hope this helps.

George

> I have a unit with a 1.2 G AMD processor running Win2K. It was
> working fine and was left on all night to start a tape backup. In the
> morning upon turning on the monitor we found a floating no signal
> video cable error. On reboot it will light up the hard drive light
> briefly. It does not boot from 3.5 or CDROM. I tried taking out all
> the cards except the video. I tried different slot on the video card.
> I tried  a different battery. I tried different video cards. I tried
> removing all the RAM. It was working fine when it was left on. I do
> not believe anyone was there after hours. I looked at the jumper
> setting, I believe it is correct. The unit has Norton anti-virus,
> Zonealarm Pro and Mailwasher installed.
> I tried the hard drive in a different unit. It starts up windows 2K
> and goes into a continue reboot. It will not go into safe mode.

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