I have an optical mouse that came with my Mac Pro plugged into the USB port on the keyboard. After a year of working normally, the trackball all of a sudden stopped scrolling down. It scrolls up just fine, but not down. Any thoughts?

I have an optical mouse that came with my Mac Pro, the only thing plugged into the USB port on the keyboard. After a year of working normally, the trackball all of a sudden stopped scrolling down. It scrolls up just fine, but not down. Any thoughts?

Well
I tried all of the suggestions, sort of. I did not have alcohol wipes, but I did take alcohol and pour some ona white paper towel and then rolled the mouse touch ball aroound and that finally cleared up the problem.  Just inverting it on paper did not do the reick, it needed some help with the alcohol.  Of course the probelm is the debris that gets inside and it really needs to come out.
This is a huge problem for RIM devices users too.

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