PC randomly shows black screen

  Hetti 10:02 16 Nov 2015
Locked

PC running win 10 is randomly crashing (black screen)been happening for a couple of months now. It is hubbys PC and he seems to thinks it started happening when he clicked on adds on his home page ran virus test Kasperskey and malwarebytes they find nothing. I though it may be overheating so downloaded "Speccy" it shows CPU running between 41oC 46oC, motherboard 48oC,without running any program's I don't know if these temp are OK and would appreciate some advice. If its not overheating what else would make PC display black screen?

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