This is follow up post to a continuing problem with my apple optical pro mouse. The mouse won't track all the way up the screen nor will it track sideways at all. I received several suggestions from my original post but they didn't help. The last suggestion was to restore my system via time machine to a date prior to the issue;however, I have tried doing that and it still doesn't help. During the restore process, the mouse works; after the restoration is done and the computer restarts; the mouse doesn't work. The mouse is connected via usb to the usb port in the keyboard; I tried a new mouse but no change. I have run hardware test and disk utility and everything is fine; I also tried reinstalling snow leopard but no change; the mouse seems to work fine during these tests but not after restart.I am at a loss and appreciate any help. FYI: the computer is a macpro.