Friends PS2 mouse suddenly went erratic and then stopped working on his system (P111 550,256 ram, WinXP,32meg TNT2). I ran latest Nortons’ virus check and other utilities-no faults detected. I tried a USB mouse it worked but the keyboard failed. I then tried a seriel mouse. Both it and the keyboard worked fine worked and has been working fine for the last two weeks. Any ideas? It’s a Mystery to me!!