I need help with my computer crashing.
I've an AMD Athalon XP w/504MB RAM running Win98 Second Edition.
The computer often crashes (no mouse response, no cntrl-alt-del) after
startup finished.  Even pressing the reset button sometimes does not
work and I have to shut all power off.  Subsequent restart crashes so
early that my monitor sometimes has "no signal" display, or it never
makes it through the Scandisk.  Repeated power-off/power-on gets
eventually gets me through startup and working ok, but it may take up
to 6 attempts in 20 minutes or more.

I've reinstalled windows, replaced the hard drive, re-seated the
memory, but problem continues.  I get the feeling that the computer may
be crashing until it "warms up."  I can only guess that maybe there's
something tempermental with the motherboard?  I'm at wits end and I
think my only solution is to can the entire box and buy a new one.

Any ideas are appreciated.  
Thank you.
-Tony