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From what I know HP doesn't give you alot of wattage when it comes to PSU. Normally they supply you with 125 watts or a little more maybe it could be the power supply. Since you added more stuff to the computer the PSU cant handle it and yes I agree with dust and junk that builds up on those computers. and also check whether the fan is running on the cpu. I think your computer is heating up and shutting down. Maybe someone else can enlighten on this situation.
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