Don't worry, you are not the only one. I had that problem and it took about 1 week before I could find a fix. The red x over my speaker drove me CRAZY. Silence is not always golden. According to www.noaudiooutput.com there can be several fixes, it all depends on your cause. You may try reinstalling your driver in safe mode. If that doesn't do it then check out noaudiooutput.com, that is where I got my fix