my computer was working fine and i was looking around in the F8 screen when i misclicked enable low resolution video 640x480. after that, my screen went black but not my keyboard so i knew my computer was still on. i waited for a few minutes for my monitor to respond/turn back on and then i shut down my computer trying to see if resetting it would work, but the problem is that my computer wont turn back on. im not sure what to do so I appreciate any answers.