Roger's Tech Support suggested this.
While I don't have an 8800, the Track Ball on my 9000 suddenly quit working when scrolling to the right.
Roger's tech support provided a quick and simple solution.
First ,turn the phone off to avoid activating applications you don't to run right now.
Second, take a thin, clean and dry cloth, ( I think a lint free cloth would be best). Using the cloth, scroll up with a slight pressure for 30 seconds. Then down for 30 seconds, left for thirty seconds and last, scroll right for thirty seconds.
While scrolling right, I accidentally pressed the power button. As soon as the phone lit up, I saw the icons successively light up as well while performing the cleaning by scrolling to the right with the dry cloth.
The tech said he'd never heard of this problem with the Bold but suggested that perhaps using the phone shortly after applying hand lotion or having moist or wet hands when using the phone might contribute to the trackball malfunctioning. I agree this likely was the case since I frequently use hand lotion for my dry hands.
Good Luck,
John
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