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August 4th, 2025 14:27
U2421E, MacBook Air, USB-C signal not detected
I have been using the U2421E with MacBook Air and it has been running well since a year. I am using the USB-C cable that came with the U2421E. However, since a day the U2421E suddenly stopped working. It's charging the MacBook Air but says "No USB-C signal detected".
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DELL-Chris M
Community Manager
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August 4th, 2025 17:30
Dell GHN (Get Help Now) chat technical support must verify the ownership and warranty status. Click the blue "Get Help Now" on the right to start a private live chat session. Share the private Service Tag with them. Once verified, they will troubleshoot with you.
Do this troubleshooting and post the results =
* Turn the U2421E off
* Disconnect every cable and device from the U2421E
* Press and hold in the U2421E power button for 8 seconds
* Turn the MacBook off
* Disconnect the USB-C cable from the MacBook
* Connect the Apple provided AC power adapter to the MacBook
* Open the lid and turn the MacBook on
* Reconnect the power cable to the U2421E
* Reconnect the USB-C cable to the U2421E
* Reconnect the USB-C cable to the MacBook
* Turn the U2421E on