1 - see the CPU fan, clean it if it's too dusty
2 - complete virus and malware scan just to be on the safe side (under safe mode, turn System restore off and when you're done turn it back on)
3 - turn PC off and make sure that eveyrthing on the motherboard is seated nicely in their places (slots) - RAM chips, video cards etc, simply push them gently into their slots
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