Ignore my laptop comment. I have three dead ones on my bench. Sigh.
Doesn't sound like it's getting better. Too many failures after a restore/install. Does any old linux livecd work with the hardware? If it has troubles with that I'd run a memcheck. Before writing more to the disk. You could have dropouts that the POST isn't finding.
Or...
You have business insurance, right?
Set the system
somewhat near a table edge. Leave a bit of your lunch on it.
Invite that cat you just adopted into the room.
Oops.
