0. Dang! You're way too fast for me. You must be every employer's dream. What was the original reason this computer wasn't being used?
1.
Floppy Drive.
a. Where is the floppy drive in the Boot Order (First, Second, Third, Fourth)?
b. Was there a non-boot floppy in the drive?
c. If you've disconnected the floppy drive, on general principle, I'd
disable it in the BIOS.
2.
Blue Screen of Death (BSOD). If the screen flashes by too fast to read, you can request operating system not to restart so it stays on BSOD. Not sure if that's the case here, but it's worth a try.
From the Windows Advanced Options Menu select the "
Disable automatic restart on system failure".
If you can read the BSOD,
post the "exact" Stop Code string (with its four parameters) and any error message and/or module name it might identify.
3.
Windows Advanced Options Menu. Use the F8 function key during system startup to access the menu. Tap the F8 key once or twice per second as you startup the computer (or
immediately after POST completes and screen flashes black prior to displaying Windows XP logo with its processing bar display).
When the menu comes up, use the up/down arrow keys to select the line item you want.
4.
Memory Diagnostics. Test the memory.
http://www.memtest86.com/ provides "free" diagnostic software that runs from either a bootable floppy or CD. Use the "Free Download" link from left side navigation menu. Run several complete passes.
5.
Hard Drive Diagnostics. Most drive manufacturers provide free diagnostic software that runs from bootable floppy or CD. Links may be found
here.