Overheating most likely, but it could be the graphics card, processor or even power supply. If he is playing games it could even be that the power supply simply is not up to the job of the video card, if there is one fitted.
You can download a program called speccy, you can use it to monitor the temperatures and this would be a big clue if it is overheating or not.
Last edited by: RattleandSmoke on Wed 17 Jul 13 at 21:04
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