hello, i have a laptop quite new, OS WIN7 64 BIT with nvidia graphic card/512mb ram recently m/b was replaced and when i got it back , when a 3d application runs after a few minutes, laptop shuts down. before m/b was replaced same application was running smoothly . any ideas why does that now?
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It sounds like the CPU or video chip is overheating, probably because your laptop was not put back together properly. Take it back and have it repaired for free!