I installed another stick of 4 GB ram into my computer recently. Everything was going smoothly until I booted it up, then it gave me two choices, one was to start the computer in default values, and the other one was to press F1 and go into bios and set it up. I tried pressing F1, but had no idea what to do, so I exited the bios. After that, I have been getting a black screen every time I try to boot the PC. I've switched ram around, made sure it was clicked firmly in its socket, but nothing helps. Does anyone know how to fix that problem?