My other computer keeps messing up?

After it's been on for a while,the monitor will shut down and go blank.The yellow light comes on.If you turn it off and then back on the green on light lights for a moment then goes back to yellow.You have to unplug the computer for a couple minutes to get it to come back on.It will stay on for a couple hours before doing it again.So whats up?

Answers:
This is an energy saving feature.
u might need a new monitor because this happed to me one time and i had to get a new one i dont really rember what was rong with it tho
take it to a local service and tell them what happened. did you use it non-stop? don't you have a disk with drivers for your monitor model, do you? when you start the pc install those drivers ;)

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