I have the weirdest thing going on... I unplugged my iMac a couple weeks ago, and when I plugged it back in, everything booted up fine, but when I moved my mouse, something was really wrong. If I move the cursor left, my entire desktop shifts to the right, when I move it the right, my entire desktop shifts left. same with up, down, any direction! Anybody had this problem?? I have run cocktail, tech tool, disk utility, they all say systems green. I hope I am not screwed. Help please!!