|I might doubt the rootkit but they do exist.|
The thing is it seems like the computer is not booting past post. That should mean a bios issue. Sure the bios can have a virus.
Dunno about the screws deal.
If you need this then you should at next time it boots correctly, you need to make a complete backup of your important data.
To troubleshoot this you need to offer more information as to the boot sequence and what all you see. Can you access the bios. Do you see any other text while booting and such. Any odd lights that you might notice.
Playing to the angels
Les Paul (1915-2009)