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Computer Shut Down

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I have a problem with my pc, it keeps shutting down not like saving files but like the power just got cut and if that happens I cant start it up again unless I turn off the power supply on the back of my pc and restart it, also I bought a new powersuplly of 500 (old one was 300) but it still didnt help because it keeps going off and the same effects
Does any body know what hardware is broken ?
I know is not a Virus