![]() I have two techniques for fixing this, one to follow the other. This happens every so often: if I go to settings > privacy > thunderbolt, I’ll see both my docks listed as “disconnected” even though I’m plugged into one or the other. The third method I use is needed when the Dock isn’t recognised by my computer. What I do in that case is unplug and replug each of the cables going to the screen in turn. Even after the computer and dock have been reset it doesn’t seem to see the screens. Sometimes, my computer doesn’t seem able to read or recognise screens through the dock (this often happens when I get the peripheral crash discussed above). Hold the power button on the dock down for 45 seconds.Unplug the dock from power and from the computer.In a chat with a tech, they told me how to reset the dock (I don’t see this anywhere obvious on the Dell site): ![]() Looked through the Dell troubleshooting guide and found nothing. This afternoon I came back from a meeting and my computer was hibernating and the dock was dead: no power light, no light on the Thunderbolt cable, no response to commands, and no screen, sound, or internet pass through. But I use it quite often to reset the USB for peripherals (I have a real problem adding tablets ( WASCOM or Remarkable) or phones (Android) via USB via the dock: it somehow seems to kill the dock’s ability to work with peripherals and then I use this to reset it (while rebooting the computer)). This one I discovered when the dock was “bricked” (i.e.
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