From: JClark on 30 Nov 2009 18:28
This is embarrassing, but I think I should post it. I changed the USB
mouse to a new one and the problem seems to have disappeared. The one
which was not working was an old IBM USB mouse. As soon as I bought a
new wired USB mouse today and put it in, the problem seems solved.
So now I'll reset the Southbridge voltage back to its nominal 1.20v.
I appreciate the help and apologies for not trying the simplest
solution first. That old mouse always worked fine with my laptop!