Thanks in advance for anyone who can help. My 2009 27" iMac suddenly starting having mouse issues, rendering it almost unusable. The best way to describe it would be as if the mouse were permanently stuck in "scroll down" position.
I've tried a Logitech mouse, HP mouse, and magic mouse - all connecting in different modes (bluetooth, USB and USB dongle).
Here's a screencast of the issue in action:
Any possible solutions? Thanks!