I'm sorry if this has already been posted / answered, I did try search first, but my TiBook 667mhz/1gb Ram has been running panther fine for a while now, I upgraded it to Tiger along with my Powermac Dual 1.8 G5, everything was fine........ until: The TiBook just won't accept mouse clicks... none of them, at all, even at the logon screen! I've tried the touchpad with & without a usb mouse plugged in, tried a apple usb mouse and a MS Intellimouse Explorer, they all work fine on other computers but alas no click's recognised. very odd. Can anyone suggest anything? If any changes have been made it was by my sister, who's account can't administer anyway. I'm about to wipe it off and try again or revert back to panther. Thanks alot.