I know I've read somewhere that certain HDMI cables won't work; I tried to find the article to link to it, but I haven't been able to yet. I'll keep looking and post it when I find it. Anyway, I read that some cables won't work with the Bionic; there were a few people having problems with getting audio to pipe through even though the cables seemed to work with other devices. Once they switched the cable out, they were fine. Most of the cables were bought from discount internet sites, so I'm not sure but maybe that's where you got yours? I bought a cable from Amazon and am using it with my HD dock and everything works perfectly. Try to see if it works with another cable before you do anything drastic with your phone... I did a factory reset on mine about 5 weeks after I got it 'cause I was having all these issues with it. I was told it was probably an app I had installed, but I had installed so many and didn't know which one it was, so instead of deleting everything one by one (like I should have), I went the lazy route and factory reset everything. It was a pain redoing all my settings and apps and stuff and I eventually found the app that was causing me grief. Ironically, I looked at that app and questioned whether or not it was the one, but I guess I was really hoping it wasn't 'cause I liked it so much.