thanks g3force - unfortunately I've cleared it a few times to no avail.
I've spoke with abit and the tech support rep claimed that he had no record of people having issues with the combo. Of course, I'm sure a lot of people have moved on from the abit boards now that they are dead.
I'm really running out of ideas of what the problem is, though have you tried using a USB to PS2 converter (if possible)? Besides that I can't think of anything else that would fix the problem, though it may be worthwhile if you see if this issue occurs with another system.