So I've had this phone for two or so weeks now, and after installing Skyrim (I don't know if this has anything to do with it, just throwing it out there), suddenly my computer stopped recognizing my Android. There's no drop down notification bar, but the phone charges. There's no recognition from my computer. No error messages, no nothing. I'm running Windows 7, my Android SCH-R720 was perfectly up to date. I've tried multiple computers, multiple SD cards, multiple USB cables, a factory reset, etc. Help?