My 5,1 Mac Pro makes a loud beep every 15 minutes. (For a week now.) Apple said there's nothing they can do over the phone and I need to take it in to the genius bar. I'm still planning on doing that but thought I'd throw it out to crowd to see if there's any other suggestions. I've already: 1) Reset PRAM 2) Un-plugged it for 5 minutes 3) Run Disk Utility checks on all disks 4) Run a RAM-checking program 5) Completely failed to get Apple Hardware Test to run, either locally or internet-based. (It just starts up the OS no matter what I try.) Anything else I should try?