Cannot Play full screen games

I have an AMD Radeon HD 6900 on my new rig I got for Christmas. For some reason it refuses to let me play games in full screen mode. When I try, it seems to put the system into hibernation after a few minutes of play. I have checked and it does not appear to be an overheating issue. I can play the most recent games in full screen window with no problem. My major gripe is that since I like to play some older games, many of them do not have a windowed option. I would very much appreciate some help.
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More about cannot play full screen games
  1. Power supply?
  2. Are you asking what power supply I have or just posing a possible solution? Either way, it's an 800w
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