Are there any alternatives to "The mic's not working."

 Yes, there are many alternatives to "The mic's not working," depending on the situation.

Casual

When you're talking to friends or in a relaxed setting, you can use phrases like these:

• "My mic is dead."

• "I can't get my mic to work."

• "My mic's acting up."

• "My mic is on the fritz."

Professional

In a work or more formal setting, it's better to use more specific and professional language:

• "I'm having microphone issues."

• "The microphone is not picking up any sound."

• "My audio input is not working."

• "The microphone is unresponsive."