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Welcome to JustAnswer. My name is Ren and hope you are doing great. I will be assisting you today. May I ask what troubleshooting steps have you done ?
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Please do this, Turn off your macbook air
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. Turn on your Mac. Press and hold the Command-Option-P-R keys immediately after you hear the startup sound. Hold these keys until the computer restarts and you hear the startup sound for a second time.
That's ok, as long as you follow the steps above it will refresh your system.
You will need to have USB keyboard if that is the case. but normally if you follow the steps above it will solve the issue.
You are welcome.