A similar thing happened to my power book awhile ago. I don't believe you are going to be able to get it on to do any diagnostics. The way it was explained to me is that some piece of pertinent hardware has died. The number of beeps and blinking lights indicates the piece of hardware. You're gonna need to take it to an apple store if it's under warranty. In my case (three beeps, I think) the ram slot died, leading to a new logic board.