Hello,when I try to plug in a microphone or some other line (such as guitar amp or keyboard through an aux cable) my computer won't pick up the sound. Audacity comes up with the message "error while opening sound device, check the input device settings and project sample rate". Sound Recorder says "an audio recording device can not be found".
Might go to the Control Panel, select Sound, and check the recording tab. There check to see if the 'microphone' and 'line in' are turned on. May be slightly different depending on the audio chip and driver you are using.