Thanks for the tip. I'm doing this on an ASUS A7V8X-X motherboard also!
Sounds like you're grasping for straws, so here's a straw:
I recently had a case of an Adaptec 2940 with tape and acanner attached
doing some weird crap. The fix was popping the motherboard battery out
of its socket and temporarily jumpering the pins that cause CMOS to be
cleared. This was an ASUS A7N8X - deluxe Ver 2.0 m/b.
Greg Gulik http://www.gulik.org/greg/
greg @ gulik.org