could there be any possiblility that it might be overheating?

also do you store your music on the same hard drive as your games or a different device? if you had your music on a portable hard drive seperate from everywhere else then its might be accessing the hard drive thats causing it to reboot.

also what game was it that you ran before? it could be a problem with them game itself.

I have nothing out of the ordinary, save the LAN set up.  No external music, etc.  Sometimes it will restart during the POST. Things are everywhere, in every sense.  Sometimes I'll boot with default BIOS settings, sometimes I won't.  (Still trying to get AMD Cool N' Quiet to work), my ATX case isn't quite an ATX case, so my cards dont fit quite right.  The case looks nice, but it's very poorly built.  MGE must be morons. I dunno.  I think it might be my grphics card, the case holes aren't where they should be so the card is just kind of hanging there.  I think this might be it, but then again I never touch it, so why should it mess up if it works at all?  I've never had it restart while I was playing a game either, except the simulators.  Both Medal of Honor: Allied Assault and Command and Conquer Generals: Zero Hour will run without interuption.  It's a mess.

Probably a dumb suggestion that you have already thought of.........

Have you run a virus check with up to date software?

best,

................john