Hi my macbook air 2021 has turned to black screen.

Hi abegail146,

If your Mac appears to be stuck on a black screen, follow the steps here: If your Mac starts up to a blank screen

Try to start up from macOS Recovery

If your Mac seems to be turned on but the screen remains blank, follow the appropriate steps depending on whether you're using a Mac with Apple silicon. If you're not sure, you can try it both ways.

Apple silicon

1. Press and hold the power button for about 10 seconds, until you see the startup options window, which includes a gear icon labeled Options. Select Options, then click Continue.

2. If you never see the startup options window, release the power button, then repeat step 1.

Intel processor

1. Press and hold the power button for about 10 seconds.

2. Press and release the power button, then immediately press and hold Command (⌘)-R until you see an Apple logo or other image.

If you need more help after going over all the steps in the article, contact Apple Support. They can be reached here: Get Support, or by calling the most applicable phone number from this list: Contact Apple for support and service.

Best regards.