so after building my new pc i have experienced a few little weird issues, the main one is while gaming the screen will go black that i am gaming on for a few seconds then go back to normal this only really happens after a bout an hour of playing. im using my old gtx 1060 6GB, with this https://uk.pcpartpicker.com/list/wNjBMv with a seasonic focus gx 850watt psu. that is the main problem the other is i dont seem to be getting power through my usb slots while the pc is off, my old pc used to do it fine but this one wont for some reason i have gone into the bios and havent found anything to change to enable