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User profile for user: Readysteadyuk
Readysteadyuk Author
User level: Level 1
4 points

Macbook Air M2 won't connect to Dell U2421E monitor

I have a new MacBook Air M2 and it will not connect to a Dell Dell U2421E monitor. I have all the connectors supplied from Dell and also a USBC adapater. Nothing will work?


I have tested the same leads and connactors on an older MacBook Pro (2019) and the Monitor works fine. It is the brand new MacBook Air M2.


I chose to buy the Dell monitor after reading reviews of the best monitor to use with the new Mac.


Any suggestions would be great, or if I need ot send the monitor back and buy something compatible.

MacBook Air (M2, 2023)

Posted on Aug 27, 2023 5:30 AM

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User profile for user: Servant of Cats
Servant of Cats
User level: Level 6
18,184 points

Aug 27, 2023 6:51 AM in response to Readysteadyuk

Dell UltraSharp USB-C Hub Monitor – U2421E


24", 1920x1200 @ 60 Hz monitor. Ports include

  • DisplayPort
  • HDMI
  • USB-C (DisplayPort, Power Delivery) upstream
  • USB-C data downstream
  • DisplayPort MST downstream
  • USB downstream ports
  • An audio output jack
  • An Ethernet port


The resolution and refresh rate should be well within the capabilities of the M2 MacBook Air.


A couple of things you may want to check:


  • If you are using a USB-C to USB-C connection, make sure that you are using the USB-C (DisplayPort) upstream port on the monitor, and not the USB-C (USB) downstream one. If you have tested with both the older MBP and the newer MBP without moving the cable on the monitor end, you may have ruled this out.
  • If you are using a USB-C to DisplayPort connection, make sure that you are using the monitor's main DisplayPort and not the DisplayPort output (meant for daisy-chaining monitors when using PCs that support MST).


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Macbook Air M2 won't connect to Dell U2421E monitor

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