sgt bombulous said:
Not that I could see. They always talk about the oils on your hands, or shorting things out etc... That's what I was worried about. But no visible dirt for sure.
I wouldn't worry too much. Like jay_nar said, if there was a major problem you probably wouldn't even be able to boot. Still, keep your eyes and ears open for anything suspicious and if you change anything in the BOIS make a note of it (settings before change, after chance, any impact those changes had on your PC). You should be fine but it doesn't hurt to be safe :P