Why is my pc losing signal after some time?

My pc works fine for some time whether it be a couple minutes or a couple hours.It restarts sometimes without warning or just loses signal and won’t power off unless I hold the power button.I have checked the temperatures and they do not seem to be the problem.

Ryzen 3 3100

Pny 3200mhz ddr4 ram

Rx 570 sapphire

Msi a320m a pro max

Evga 650 watt power supply

WD green 240 gig ssd

WD 1tb hdd

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Hi,

Check for any Critical, Error or Warning events logged in Event Viewer at the time that the problem occurred to see if that gives any clues as to what's happening

Run an sfc /scannow command and check that the system files are Ok

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There is no irregular errors in event viewer and sfc says it’s fine

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@Anonymous

When you say "...just loses signal and won’t power off unless I hold the power button.", how do you power it off otherwise if the screen is blank as you can't see where to click?

For the sake of elimination as I don't know what you've tried:

Have you proved that the problem is not the monitor/monitor cable when the screen goes blank?

Check that the memory is OK by using the Win 10 memory diagnostic tool

Have you overclocked the CPU or the GPU?

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