Mouse keeps moving to the corner of the screen

Just a few days ago, my iMac's mouse started to jump randomly to the top left corner, bottom left corner, or just the bottom of the screen. It has gotten so bad I can play no games and browsing on the web has gotten seriously annoying.
I've tried everything to fix this. I have used both a magic mouse and a regular USB mouse, with both having the problem. I have tried multiple surfaces and it doesn't seem to be a problem with the surface or the optics of either mouse. I believe this is a hardware problem.
I have also tried resetting bluetooth, restarting the computer, and resetting NVRAM. I'm at a loss now; this has gotten very annoying.
Are there any other suggestions for what to do?

I'm having a simlar issue but with very different circumstances. Recently, after installing he most current update for Mountain Lion, my mouse point has been jumping randomly to a different area when scrolling. However, this occurs when I use the trackpad rather than the magic mouse - even after turning off bluetooth radio. It appears this problem occurs when scrolling through a web page in Safari.

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