Dell U3421WE Users Guide - Page 77

Universal Serial Bus (USB) specific problems, USB-C, Prioritization, High Data, Speed, Common

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No video at HDMI/ When connected to • Unplug the HDMI/DisplayPort/USB DisplayPort/USB some dongle/ Type-C cable from dongle/docking Type-C port docking device at device, then plug the docking the port, there is no Thunderbolt cable to the notebook. video when Plug the HDMI/DisplayPort/USB unplugging/plugging Type-C cable 7 seconds later. the Thunderbolt cable from the notebook No network connection Network dropped or • Check to ensure USB-C intermittent Prioritization is set to High Data Speed. • Do not turn Off the display during network connection. Universal Serial Bus (USB) specific problems Common symptoms USB interface is not working What you experience USB peripherals are not working Possible solutions • 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. Troubleshooting │ 77

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Troubleshooting± ±
│
± ± 77
Universal Serial Bus (USB) specific problems
No video at HDMI/
DisplayPort/USB
Type-C 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/USB
Type-C cable from dongle/docking
device, then plug the docking
Thunderbolt cable to the notebook.
Plug the HDMI/DisplayPort/USB
Type-C cable 7 seconds later.
No network
connection
Network dropped or
intermittent
•
Check to ensure
USB-C
Prioritization
is set to
High Data
Speed
.
•
Do not turn Off the display during
network connection.
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.