I have installed Audacity 2.0 on a new Toshiba Windows 8 machine. I have an Audio Technica turntable with an USB cable plugged directly into the machine. It also has RCA cables jacked into a tuner/amplifier.
After set up to the best of my understanding, the attempts at recording off the turntable result in very garbled music. As a last resort, I thought perhaps the Audacity was getting some type of feedback interference from another program installed with the machine. I went into control panel>device manager>Audio input and output; and disabled the audio input. I thought I’d be able to enable it later if need be. Now I have no sound and the input audio option is gone.