My hp laptop goes black after 1 hour of usage

Every time i turn on my laptop it works for 1 hour or so and then suddenly the screen goes black. i have checked the task manager it shows 100% utilisation of cpu and ram. I've to remove the power cord and switch it on and it works again for another 1 hour or so.

hp dv6
Processor = core 2 duo T6600
motherboard - intel

Any help would be appreciated.
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More about laptop black hour usage
  1. sounds like its over heating, what sort of surface you got it on?
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