System details please? This is definitely a hardware problem, not a Windows one.
What is your motherboard? Processor? Video card? RAM? How may RAM modules have you got installed? If more than one are they the same brand and/or type? What brand and speed?
Those are the sort of details we need to know to be able to help. Something is wrong in your system, and if you keep turning it on and off continually like that, you will end up causing permanent harm to something or other in there! ;)
Catweazle
Grandad
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