I have an Hp media center pc m7250n and I seem to have some problems with it lately. I'd be on the computer for about 15-20 minutes and then it will automatically shut itself off. Afterwards, I have to wait about a minute before I can restart it again. I thought this problem may have something to do with the fact that the dvd-rom broke and maybe something got jammed inside. Or maybe it has something to do with the fan since it's been making some weird noises for a while. I'd like to know what I can do to fix this problem.