Hi, I was using my computer today and I left it alone for a short while, then when I came back suddenly the sound was not working, even though the volume was turned all the way up. I restarted it a few times, and eventually the audio output device was gone (there was an x in the icon instead of sound waves, and when I hovered over it it said "No Audio Output Device is installed"). I also did a clean reboot, which didn't work. I went to the control panel, clicked Sound, tried right-clicking where it said "No audio devices are installed" so that I could choose to show disabled devices, but that was already enabled. I went to Device Manager and clicked "Sound, video and game controllers", but the only thing in the dropdown was "Bluetooth Audio Device". Does anyone know what I could do about this?