This message is coming a tad LATE but for those that encounter the same problem, I offer my testimony.
I had the same grounding issue Rmac57 spoke about. On one occasion, taking eveyrthing apart, and then putting it back together again proved to be the solution. Another instance, I simply took the RAM out and placed them in a different configuration. It's almost as if during a boot-up crash, something was written to cache which, for cautionary purposes, disallowed the BIOS to boot. I dunno, just a theory from an inexperienced newbie like myself.