I am kind of an amateur when it comes to dealing with computer problems, so bear with me. Whenever I play a game that requires a moderate amount of graphics for it, my computer crashes. When it crashes, there is no warning. It just shuts down completely and I have to press the power button to turn it on again. What I'm asking is if anyone would be kind enough to tell me what I need to do to fix this and how I need to do it.