Help! No input from microphone!!

I don’t know if [u]this[/u] applies to Windows 7 as well as Windows 10?

If I tap hard on the microphone itself, I do get bumps on the waveform, but it won’t record any actual audio.

And you don’t hear that “bump” when you play back? Make sure you’ve selected your regular soundcard/speakers as your Audacity playback device. Sometimes when you plug-in a USB audio device Windows wants to use it for recording and playback, even if it’s not a playback device.