Why does my computer restart when playing games?

Computer monitor goes to sleep when playing games?

When playing games such as Maple Story or League of Legends after about 15 minutes my monitor flashes black and goes to a screen saying: DVI = no signal VGA =no signal Auto-Switch Source = On Default Source = DVI-Digital Recommended Setting = 1600x900 - 60Hz and after that screen, a white box appears saying Monitor Going To Sleep, and I can't get my computer on without having to restart it because there is no signal no matter how many times I try to scan for one. My graphics card is the NIVIDIA GeForce GT220. HELP !
Answer:

A few things to try: Check cable connections between computer and monitor. If they're bumped into or get lose it can happen. Update video drivers. Check nividia's website. Does it only happen in games?

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