DiI've got an older home built PC and I'm trying to run down the cause of a problem. I'm hoping you may have an idea. First off, the system: P4 (socket 478) 2.8 Ghz Abit BH7 v1.1 MB 1gb RAM The problem: We are getting a alarm sound from the MB. It sounds like a heat alarm to me (HI/low like a...