I have a Gigabyte GA-H270N-WIFI motherboard with an Intel i3-7100 CPU. I am using the Intel HD graphics 630. Once or twice a day, my screen goes black for about 5 seconds, and then returns to normal by itself. I think this is a graphics system issue. I thought it might be caused by excessive heat, so I thoroughly cleaned the dust away from the motherboard and CPU, but the problem persists. If it is indeed a graphics system problem, how can I determine if it is caused by the CPU or the motherboard?