My PC keep randomly blackscreening but continues running

Oct 16, 2018
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Specs:
Ryzen 7 2700x
Nvidia Geforce GTX 980
Corsair Vengence LPX 16gb
Asus B450-F Motherboard
EVGA 750W gold power supply

I recently upgraded my PC and now for some reason my PC will randomly blackscreen but will continue running, it most likely isn't something wrong with the displays or cords because whenever this happens I cannot turn off my PC with the power button, I have to switch off the PSU in order to restart. Whenever I turn my PC back on I get a warning saying "+12V Voltage 3.335 V" which I have no idea what it means. Does anyone know what the problem is here?
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