strange, I've never come accross this b4. I am temporarily running on a k7s5a with a cheapo Chic opticle mouse. Twice over the last 15-20 hours of use the mouse curser has stoped responding but the mouse laser has continued functioning. As such I fear it may be a mobo prob and hope it is o/s related, really only posted because it just happened while I was posting about else. The only thing I've tried to get it working again is to remove mouse and plug back in again. Anyway has anyone got any suggestions on this one??