Connecting Macbook Air M2 with Alienware AW3821DW

Hi emy8,

Thanks for posting here in Apple Support Communities. We understand that you're having some trouble with connecting the external display to your MacBook. Are you following the steps listed here to connect your display? See: Connect a display to your Mac - Apple Support

Connect your display

Connect your display to power, then connect your display to your Mac. Check the ports on your Mac to find out whether you need an adapter. If you're using a USB-C or Thunderbolt adapter to connect your display, the adapter must be compliant with DisplayPort Alt Mode, Thunderbolt 3, or Thunderbolt 4.

If you use an external keyboard and mouse with your Mac notebook, you can close the built-in display after you connect your external display. You might have to press a key or click your mouse to wake the external display. To use your Mac with the display closed, you need to connect your power adapter or connect an external display that also charges your Mac, such as the Apple Studio Display or 23.7-inch LG UltraFine 4K Display.

If your external display doesn't turn on after you connect it to your Mac, connect your display while your Mac is off, then wake or turn on your Mac.

If you still run into issues, please check out the steps listed here: If your external display isn't detected or appears blurry when connected to your Mac - Apple Support

Have a nice day.

Hello emy8,

We appreciate all of the troubleshooting you have completed. Please contact Apple Support here for further assistance: Apple Support

Let us know if you have further questions.

Take care.