PC help

My PC screen randomly went black while I was playing a game, and the VGA light turned on. When I rebooted, the cpu light turns on for a second, then turns off and the DRAM light turns on for a second, them the VGA light turns on permanently, screen completely black and unable to do anything. I have already tried clearing the CMOS, reseating and testing RAM, and the cable to my monitor. Any other ideas?

Edit: Just got it back from Office Depot. It worked in store according to the tech but when I brought it back home it did not work again. Possibly my Displayport cable? The VGA light is still on, so maybe it’s my outlet? Any ideas would be nice.