Not sure if this has been posted yet, But recently there was a windows update that seemed to mess mine up. I just system restored back to before that update and it works just fine now. Could be the update installed incorrectly. (The update was downloaded and installed on 3/12/14 for me. So sometime around that.) My friend got the same issue when he installed the update and after system restore it worked. Hope this helps, Because I tried many other methods posted and very few of them worked.