Quote Originally Posted by Tellos Athenaios View Post
Off the top of my head the things I can think of:
(a) The [CPU] fans refuse to come on-line, the system detects it and refuses to enter BIOS.
(b) The power regulation circuitry itself is dead: like a blow fuse.

If the thing is still under warranty, I'd get a replacement ASAP. This kind of stuff should simply not happen while the equipment is still inside its rated lifespan.
Couple years out of warranty.