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Dell U2421HE Service Manual page 17

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Problem
What you
experience
The LAN port is
OS setting or
not functioning
cable connection
issue
5. Trouble Shooting Instructions
Possible solutions
• Ensure that the latest BIOS and drivers for your
computer are installed on your computer.
• Ensure that the RealTek Gigabit Ethernet Controller
is installed in the Windows Device Manager.
• If your BIOS Setup has a LAN/GBE Enabled/
Disabled option, make sure it is set to Enabled.
• Ensure that the Ethernet cable is connected
securely on the monitor and the hub/router/firewall.
• Check the status LED of the Ethernet cable to
confirm connectivity. Re-connect both ends of the
Ethernet cable if the LED is not lit.
• First power off the Computer and unplug the
Type-C cable and power cord of the monitor. Then,
power on the computer, plug in the monitor power
cord and Type-C cable.

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