Mighty Mouse Jumping Around Screen
Hey, I just got a new 20 inch iMac about a month ago and noticed that my wired mighty mouse that came with the computer jumps around the screen somewhat often. For example, I'll move the mouse from left to right in the middle of the screen (or in any direction) and the mouse will jump to different parts of the screen (the bottom left, the middle left-side, the bottom right corner, etc.) for no reason. This happens at any time in almost any condition (with no programs open, with a few programs open, in safe mode, in any usb port,. etc.) I've called Apple Support and they've replaced my wired mighty mouse twice, they've had me try it in a 'Test User' account, and have had me archive and install Leopard. The problem still occurs. I've temporarily switched to a wireless logitech mouse and it doesn't seem to be happening as often, but I'd like to be able to use the mighty mouse. Any ideas as to why this is happening or what I could do about it? Thanks in advance.