Mouse Jumping to Top Left Apple Icon

I recently had a MacBook that had a mouse problem.  The client said the mouse was jumping to the top left no matter what she tried.  She restarted the laptop, connected a different mouse, but nothing worked.  She tried using just the trackpad and that didn’t help either.

In the end, it was a Promethan board problem and when I removed the Promethean board USB cable, everything worked fine, including both mice and the trackpad.

Solution was to replace the Promethean board USB cable.