Ok so I decided to listen to some music while I took a nap, so I played music and shut my moniter off and layed down. When I woke up I noticed the music wasn't playing so I went over to check, and the screen was black and nothing happened if I moved the mouse or pressed a key. I reset the computer, and it worked fine for like two minutes and then it went black again. Now it won't even turn on. The light on the computer turns on, and usually it lets out two beeps, and now it just stays silent. I haven't changed anything, what could be wrong?