Automatic Reboot

We’re currently running NT 4.0 server with Service Pack 6. The computer was properly shut down, moved to a new shelf, restarted, and now when it reaches the blue server-startup screen, the computer automatically reboots everytime.

Hard-drive does this in another machine as well, and last known good-state was set, and does this also in VGA/safe mode.

What could be the problem? Any help would be appreciated, as I don’t want to lose the information on my server.