Dell Thunderbolt U4025QW - Page 104

104 | Troubleshooting
Problem What you
experience
Possible solutions
The LAN port is
not functioning
Operating system
setting or cable
connection issue
• Ensure that the latest BIOS and drivers
for your computer are installed on your
computer.
• Ensure that the RealTek 2.5G 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/rewall.
• Check the status LED of the Ethernet
cable to conrm connectivity. Reconnect
both ends of the Ethernet cable if the LED
is not lit.
• First power o the Computer and unplug
the Thunderbolt
TM
4 cable and power
cord of the monitor. Then power on the
computer, plug in the monitor power cord
and Thunderbolt
TM
4 cable.
The detected
light level drops
significantly
When the Ambient
Light Sensor is on, the
detected ambient light
drops significantly
• Check whether an object is obstructing
the sensor area.
• Ensure that a webcam is not mounted
over the sensor area.
• Wipe clean any dust that may be covering
the sensor area.
• Ensure that the display is not pivoted and
placed to another monitor side-by-side.