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Your computer hangs up. There are at least two reasons. First one is the hardware. Second one is software. It looks like you likely have problems with hardware. You need to track down the problem. It's recommended to start from cleaning of the case including all radiators and fans. If did not help you need to use diagnostics tricks to fix the problem.

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Q: Problem with your computer and when you turn it on the screen is black and there is a hyphen on the top left hand corner of the screen?
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