from here:
http://webcache.googleusercontent.com/search?q=cache:nr1LkL-iiJgJ:support.dell.com/support/edocs/systems/pe2650/en/sm/beep.htm+dell+System+FRU+is+not+programmed&cd=1&hl=en&ct=clnk&gl=uswe see dell claims that message indicates your motherboard is not installed correctly. what i read this to be is, you have an improper ground contact on the board. maybe some piece of metal is making a connection, or the motherboard isn't screwed in all the way, or it's just failed.
if there's any warranty left on it, they'll probably just replace the motherboard. if not, a few things come to mind:
1. live with it
2. take apart the server completely, put it back together making sure there's no stray contact with the case/board
3. grab a new board
