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My Computer Just Turns off after about 15 Minuets of use please help it is an Hp and i was adding a new hard drive when all this started to go wrong

Oh Hot Sink Fan
I removed everything and air clean it all before it did anything
Could the fan be put on back weards
The computer works just fin in safe mode

HSF = heat sink & fan. Did you actually remove the HSF from the processor? If so (and I'm sure jam would ask you this), did you apply fresh thermal paste? If not, that could explain why your PC shuts down after about 15 mins. It's also possible that if you removed it, you reinstalled it backwards. The fan should be blowing away from the processor in order to draw heat from it. From there, the case fan(s) will blow the warm air drawn from the processor out of the case.

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