Whenever I try to play Counter-strike source, i see a black screen that goes into the main menu loading screen. After about 2 seconds at the loading screen, my computer restarts(so I never see the main menu screen).
With my other source games I tried alt tabbing during the black screen and clicking back on it after the main menu is up. That method works with all games now besides Counter-strike Source.
I read that support that steam provided after the 23 or whatever update for dod source stuff. I tried all steps and cannot figure out why my computer reboots. Help would be much apreciated becuase I have had this problem since that update.

well my comp used to do that but all i can tell you is make sure that your graphics card has the right drivers installed

second link below should cover the basic troubleshooting for game problems... see how you go.