Dell U2422H 23.8" 16:9 IPS Monitor - Manual (Page 94)

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Troubleshooting
Universal Serial Bus (USB) Specific Problems
No video at HDMI
/DisplayPort
port
When connected to
some dongle/
docking device at
the port, there is no
video when
unplugging/plugging
the Thunderbolt
cable from the
notebook • Unplug the HDMI/DisplayPort cable
from dongle/docking device, then
plug the docking Thunderbolt cable to
the notebook. Plug the HDMI/
DisplayPort cable 7 seconds later.
No video at USB-C
port (U2422HE
only)
When connected to
some dongle/
docking device at
the port, there is no
video when
unplugging/plugging
the Thunderbolt
cable from the
notebook • Unplug the USB-C cable from
dongle/docking device, then plug the
docking Thunderbolt cable to the
notebook. Plug the USB-C cable 7
seconds later.
Common
Symptoms
What You
Experience
Possible Solutions
USB interface is
not working USB peripherals
are not working • Check that your monitor is turned On.
• Reconnect the upstream cable to your
computer.
• Reconnect the USB peripherals
(downstream connector).
• Switch Off and then turn On the
monitor again.
• Reboot the computer.
• Some USB devices like external
portable HDD require higher electric
current; connect the device directly to
the computer system.