Usually I am very careful when I do upgrades to my computer, went to install a new gtx 770 and one of the screws wouldn't thread and I accidentally knocked it onto the motherboard (everything was completely powered down already, no power at all) and it fell right near my CPU color between what looked like 2 capacitors, i tried to pick it up and it slipped between them, there was no way I could get it so I used gravity to try to get the screw out by tilting it, it went to the bottom of the case and slid the case a few times to try to figure out where the screw was, I was able to get it out and the computer boots up fine and functions fine, I might be acting a little paranoid but any possibility that screw could have caused damage when it fell onto the motherboard or when I tilted it to get the screw out? I believe it was mainly sliding on the bottom, I used a flashlight and I didn't notice anything.