ei guys, im new here and i would really appreciate it if someone could help me out regarding this matter. i have a asus a7s333 motherboard that works just ok except for one thing, the ps/2 port for the mouse causes trouble. here's the scenario, i turn on the computer mouse cursor moves ok, then for about ten seconds it goes berserk. what i mean is it jumps all around the screen and does some clicks with me even clicking it, every time i try to move it, even just a little, it jumps all around the screen. and it even has its pattern. from start button going up then going right, same pattern everytime i try to move it. please rule out the following because i already tried this. clean the mouse (done) replace mouse (done) clean ps/2 port (done, i even sprayed some air in it to remove the dust) formatted my pc (done, although i know this won't help) formatted my pc without the mouse (done) formatted my pc with a serial mouse (done) by the way my motherboard doesn't recognize a serial mouse. why is that? so the root of the problem i think is the ps/2 port for the mouse, any ideas on how to salvage or repair this? thanks!