On 1/4/06 10:04 AM, net kat wrote: > logitech marble mouse..for years. I've run Onyx So if that's all you've done, try: 1) Plugging in your original Apple mouse or any other mouse in the household. Maybe something finally went haywire with the marble mouse. 2) Checking for logitech software updates. 3) Reboot the computer! That's pretty much the very first thing when there's trouble. Test. 4) Then safe boot, and reboot, and test. 5) Then boot from your OS X install CD and run Disk Utility from there. Reboot from your internal hard disk. Test. Any of these work?