Microphone not working anymore.

Hello everyone,

last night i was in a conference call on google meet while my macbook air ran out and turned off suddenly.
I turned it back on and went back to the conference and everything worked well.

When I closed the conference, I connected to discord and I realized that my integrated microphone was not transmitting anything anymore. Connecting an external microphone instead works.

I am worried because it has never happened to me, I have looked around a bit but in the audio section everything seems correct. So I went to the MIDI audio section and noticed them that the input channels are stuck at 0.

What can I do? Thanks

In System preference --> Sound: All is correct but if I do something no audio is recorded

This one is about MIDI Sound, you can see the master sound working but I can not interact with stream master 1 and 2 (they are blocked into 0)