I was working on my homework, and I had my friend over, and he was being really obnoxious. I was listening to music on my computer, and my friend started rapidly hitting the restart button on my case, then the power button as fast as he could. Now whenever i try and boot, the BIOS message says "CMOS check failure" or something along the lines of that. When it boots up all the way, the computer comes up with a blue screen of death.