I've been having this issue for like, the last week or so. Sometimes when I use the shut down option windows shuts down and my screen goes black but the computer itself doesn't shut it self of. The only way to shut it down is to pull the plug or turn of the power supply which I know can cause damages to the PC.
A similar thing is sometimes also happening when I turn on the computer. I turn it on, it shows my the Gigabyte screen and then it either black screens or keeps restarting and doing the same thing. I've also noticed that my keyboard and mouse don't turn on when this happens.
I suspect there's something wrong with my motherboard but I'm not certain, any help would be greatly appreciated.