It might be setup to go into sleep mode if it is left idle for a certain period of time. To change the settings click the following(I am assuming you have windows vista or windows 7):
Start,Control Panel,Power options,Choose when the computer goes to sleep(look on the left side),Then adjust the settings to what you wish by clicking the black arrow there.
Also check the "choose when to turn off the screen" in the same spot you clicked Choose when the computer goes to sleep.
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