Server continually recycling itselft

Boot from your original cd, have the system recovery info disk handy, and you may have to do a partial reinstall...

excuse me, the term is "emergency repair disk".

what? you didn't make one?

you may still be able to run the repairer/reinstaller.

in the worst case, you'll have to wipe and recover from backup.

if you don't have backup, well...

NT is failing somewhere with the boot - OR - you may have a faulty power supply in the computer.

First thing to check is that you don't have any loose connections in the system, it be triggering, say when the higher video mode i activated.

Check to see if you can get the server running in VGA Mode, or by using the (L)ast known good menu, which will revert the hardware settings to the ones in use the last time Windows NT made it to the logon prompt.

Random reboots are typically a power supply. The NT emergency boot disk would be helpful, but typically you can eke by without it.

If your cdrom drive is bootable, you can boot from the NT Server CD rom and select repair. The Repair program can typically find an NT installation without the Emergency boot disk

Be very careful with the repair, and do not restore any registries without thinking long and hard about it. Restoring the System registry would make the hardware play nicer, but could also change the SID of the Server, which would wreck havoc on a domain. The security or SAM should absolutely not be restored.

Try restoring key files back first and rebooting to that. You can tell that it might be the scsi driver for example by watching the startup screen in VGA mode.

If you restore any files from the NT CD, be sure to reapply your service pack the first time you get logged back onto the computer.

Good Luck