the same thing is happening to me! this is ridiculous!
i tried to do the battery pull, and it did work for about 10 minutes!
i did however figure out how to fix it. With mine, i recently had bought a game through my provider and when i closed it, it wasnt actaully closing, it was just running in the backround.
you can view the applications running by holding alt and the back key to the right beside the trackball. trying closing any unesscery applications like games and such then try it again
hope this helps