Samsung Epic 4G touch screen not working.

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http://androidforums.com – For no reason at all, the touch screen on my Epic randomly stopped working. I had a lock on my phone and I couldn't drag it up and the only way to unlock my phone was to slide the keyboard out. However, even when it's unlocked, I can't click on any icons, can't move to any of the other screens, nothing. The four buttons on the bottom work, but nothing on the main screen. The only way I can get around on it is if I use the arrow keys on the keyboard. I've tried doing a factory reset (twice) and still nothing. Anyone have any ideas? (General)