I have finally given up on the Mighty Mouse. I have had three of them, all of which failed. The scroll wheel is the problem. It collects dirt and and hangs up, eventually getting to the point where it does not work at all. I have tried all the recommended methods of cleaning which worked for a while. I know there have been other threads complaining about the Mighty Mouse, but I guess I am a glutton for punishment. So, I am back to my MacMice mouse as much as I hate it. I am amazed that Apple continues to make this product without coming up with a new scroll wheel. I think that this is a case where form outweighed function. Sometimes design can be carried too far.