The display should always work on these when connected to laptop. If not, the dock is not passing any data from the computer to the display.
If there is no display (either HDMI or DP connections), then hot-plug at least one of those cables (monitors connected and on and laptop connected and on) to see if the display is then recognized. There is a bit of an hierarchy to what fails and what you should look at on these docks. They don't have an OS, so much as firmware and their own thunderbolt microcontroller. I second Richard-Bruce's suggestion of rebooting the docks. If you don't have Thunderbolt enabled machines though, I still find the WD19 more reliable and functional (especially for dual monitors) than the D6000. The D6000 docks are Display Link USB devices and are not nearly as functional as the WD19TB devices. We have many of these docks and see very few issues with them, my opinion is that these are the best ones Dell has made so far. They are releasing a new dock this month from Dell that is USB-C, so maybe that one will provide a solution if all of the above does not work. I've used the Dell TB docks and Lenovo docks with both Dells and Lenovo notebooks designed for it. NO THANK YOU! I have yet to see a thunderbolt dock provide a reliable enough device for me to recommend for work. To those who praise or recommend the thunderbolt docks. I have the same computers on my network and we use the same docks, we've not seen the issue as yet. Force winders to reload them all, and see if it comes back. Uninstall all usb devices/drivers from Winders (if the above does not work). If any plugged in USB device works (to the dock) then you know the dock is passing data. Start plugging other USB devices into the dock (to see what breaths life) - good examples are mice, keyboards, etc. I second that I'd remove any recent updates, and see if it comes back alive. Yes I've fixed a lot of laptops this way, its weird, and shouldn't work, but it has. This is going to sound stupid, and shouldn't work, but I've seen flipping the USB-C connector over helps at times.
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