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