How can I repair the scroll ball on an older Mighty Mouse? I have a Mighty Mouse that came with an iMac nearly four years ago, and the scroll ball won't turn anymore. Is it possible to clean that or do something to make it usable again?
Try flipping the mouse upside down and rolling the trackball on a piece of paper, giving it an occasional tap to help dislodge any debris. Since the trackball is depressed while rolling , this helps debris escape from inside the housing. The paper will also help absorb any oil from your fingers that have collected on the ball that may allow debris to collect inside the roller mechanisms.


The 'official' Apple fix is to first spray the paper with alcohol cleaner, then roll the ball over it. This has always worked for me, never had to take apart.