This is a weird problem. My Inspiron 600m touchpad has been acting up. I have replaced drivers, rolled back driver, uninstalled and more. Here is the situation: Mouse pointer would work erratic or sometimes not at all. The buttons on the touchpad always worked. I have found out the following. It only "acts up" when the AC cord is plugged in. As soon as I unplug it...and go to battery power the touchpad works fine. It gets even better. While at work I tried it again. This time the touchpad works fine on battery power or AC power. However back at the hotel I am staying at...and only at this hotel, the pointer fails to work correctly when on AC power...on battery it is fine. Any thoughts ??? I don;t know why it only happens at this Hotel. Standard 115VAC as far as I know.