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#221
You could either have a problem with your graphics card or your power supply unit. I would try changing the power supply first which is cheaper to do. If the problem persist, you may have an issue with your graphics card. You can run Burning Test or other benchmark and see the results. If the screen freezes or goes black, then your VGA has a problem. If you get a blue screen, it could be your RAM or motherboard. To check your hard disk's health you can use Hard Disk Sentinel.