Audacity 2.1.2 not recording my mic?

Hey, I’ve got Audacity 2.1.2 on a Windows 8.1 PC. For some reason, the microphone that I’ve used before on this PC with this version of Audacity isn’t able to record. I’ve confirmed that my mic is working, but Audacity isn’t recording it. It detects the microphone, but it doesn’t record any sound.

Anyone know what might be going on? Thanks.

That’s a very old version of Audacity. The current version is 2.3.2 and is available via the Audacity website: Audacity ® | Download for Windows

Is it a USB microphone?
If you look in the “Recording” tab of the Windows Sound settings, do you see a signal when you speak into the mic?