Here latley, My users have been just getting a black screen showing up after they enter their bios passwords..
tried safe mode-> recovery console that was installed on their hard drive, always a black screen.
Have to use some type of mbr restore tool and whalla... everything works fine after we rebuild a new mbr.
I think it has something to do with this malware, or a crap variant of it.
every user has been windows xp sp3.
Keep an eye out.