I've had no sound on my Windows 7 64 Bit Home Premium for a couple of weeks. I've tried many different solutions from multiple websites, but I still have no sound. The drivers are all working properly, but there's no sound from the external speakers that I plugged in, the integrated speakers in the monitor, or my headphones. The troubleshooter can't find anything, and I've even reinstalled Windows 7 just now, but there's still no sound. When I click the sound icon on the taskbar and change the volume, the green bar moves, but I still don't hear the beeps from my speakers. The sound used to work fine before, on Vista Home Premium 64 Bit, and Windows 7 Home Premium 64 Bit, but it suddenly stopped. What should I do?