Ok I believe it is hardware related, that is why I'm posting this here. Yesterday I played Nhl 2003, the first game I played went fine, but the system rebooted itself during the second one, I left it like that. Later on, I installed the ud agent, and the system rebooted itself again while the agent was running, so I uninstalled it. Today, I decided to play a little hockey game, but the system rebooted itself again. So, thinking it was OS related, I decided to delete both partitions, but wanted to back up some files on cds so I burned one cd, all went fine, but the system rebooted 3 times while burning the 2nd cd, scrapping 3 cds in the process. I said F _ _ _ it ! I deleted both partitions and recreated them. I then procedeed with an XP Pro install from scratch. I formatted the C: to ntfs using the cd, all went fine. Then setup copied files, all went fine. But the system rebooted itself while installing devices (after setting up the language etc) So I deleted the partitions etc, again. It rebooted again but while copying the setup files. I don't believe it is software related because those reboots happened when absolutely nothing, zip, none was on he hdd. This is odd because it reboots at random times. At one time, during the process of installation, I heard beeps from the board telling me the temperature has hit the boundary I set in the BIOS. But the temperature has never hit the "shut down temp", so I believe this is not a heat problem. I am using the stock heatsink/fan that came with the retail cpu. I have no case fans whatsoever, only the one integrated to my ps. I am open to any opinions.