Mighty Mouse

My wireless MM used to be scrollable using the button for both up and down. For some reason, the button only moves the screen down but no longer up.

Can somebody tell me how to get this function to work both ways?

It sounds like the Mighty Mouse has some dirt caught around the Scroll ball.

Hold the Mouse upside down, then blow air into the Scrollball area while spinning and clicking it.... That's what I do when this happens and it works like a charm.

Followup

RIDE:

Amazing. It worked. High marks to you.

Glad you got it sorted out!