Since yesterday my computer sticks on a black screen with A2 in the bottom right corner when I switch it on or reset it, I cant even go into bios or anything when the error is displayed. I figured out when I unplug either the mouse or the keyboard it boots fine to windows when only one is plugged in and then I just plug the mouse back in after it passes the bios screen and its fine. Does anyone know why this might happen? Thank you.