internal speakers are not making sound

I will need to go through some basic troubleshooting techniques with you and I do not know whether you tried them since you did not provide much details on what you have attempted to do to fix this issue.

1) Open System Preferences ➔ Sound ➔ Output Tab - Ensure that MacBook Air Speakers (Internal) are selected. See image below-

2) The other way to check the same and confirm is to click the Sound symbol on the Menu Bar on desktop. See image below-

3) Ensure that your MacBook Air is not connected to any Bluetooth device that you are not using. The sound may be going there and you wouldn't know it if you are not looking for it. Just ensure that that is not happening.

4) Reset SMC by following the directions applicable to your MacBook Air here ➔ How to Reset SMC. If that does not solve things then-

5) Reset NVRAM/PRAM by following the directions applicable to your MacBook Air here ➔ How to Reset NVRAM/PRAM.

Let us know how you progress with the above. Thanks.

Axel F.

try

SMC reset      https://support.apple.com/en-us/HT201295

Zap pram   https://support.apple.com/en-us/HT204063