I have been having this issue since moving into new accommodation (maximum supply 10amps). If I have left the computer on overnight, either fully on or in sleep, in the morning the graphics card will provide no video output. Using the onboard graphics I can see it is getting a code 43 error in device manager. I have tried cleaning things out or wiggling components, but these never fix the issue. It appears to spontaneously fix itself after a while each time, but it could be related to me using it with onboard graphics. Card is an Asus 1050ti.