my mic is not working on macbook pro

If your Mac has an audio input jack that looks like a mini audio port with a microphone icon, make sure this is not in use. Macs generally can't accept audio input from two places at once, except if there is software that supports it as some Midi software.

If your Mac is younger than 4 years, reset the PRAM. Otherwise reset the SMC.

If your Mac has recently had its software updated, check the Audio Midi Setup utility in Applications - Utility folder to make sure the input settings are at 44.1 kHz.

Lastly check Apple menu System Preferences Sound Input.

Reset NVRAM/PRAM

Reset SMC