Seems like there is something very wrong in the system. Since you have tried all the drivers etc, next try other gpu.
If you do not have one, you could buy used gpus like gtx 970 or 1060 for like under 50 bucks. or if you want even cheaper you could go like gtx 570 wich is at most like 30 bucks, but usually around 25bucks. See if the system work normally with the other gpu, if it does, you sould RMA the gpu.