When I turn on my computer I don't get any sound. I have a little red "X" next to the speaker Icon and it says there are no audio devices plugged in. I tried different speakers and they still didn't work. I figured it was my sound card so I reinstalled the drivers and it worked fine...for awhile. The sound stopped working again after a couple of days. When I tried to reinstall the drivers again the problem wasn't fixed. The weirdest thing is that this doesn't always happen. Yesterday when I i booted up my computer it worked fine. But today the sound is all messed up today. This has been going on for about three months Please help me. I have NO idea what I am doing.