I recently just built this computer so its still all pretty much brand new. Im not really sure what is making it reboot but it seems like im always playing a game when it decides to do it. After somone else suggesting it was the ram i decided to check my ram with memtest86+ and during the scan my computer rebooted itself pointing that it was prolly the ram. So now i am using my old ram while the other 2 gigs is bein sent back for return and the computer rebooted itself on my old memory so now im pretty sure its not the ram. I understand that it could be numerous things such as a loose wire,drivers,crack in motherboard but it would be nice if the problem could be determined or atleast narrowed down. If also checked to see if anything was getting hot and im pretty sure its not.