I followed some foolish advice on Amazon.com telling me to do a factory ret. set to make my tablet faster (ICS 4.2.3). Now my HDMI will not work, although I am not sure if it worked before the reset, as I hadn't tried it yet. I tested it before rooting my tablet and after the reset, and it doesn't work now after the root or before I rooted it. I'd like to fix it before I sell this tablet. Any suggestions?