I had exactly the same "nothing works" problem, with a brand new laptop, latest technology, having TB4. Did you connect to the USBC/DP/PD port or the TB3/4 port? According to my test, if you connect the dock to the TB4 port, nothing works. If connected to the USBC3.2/PD/DP port, not TB4, then only some of the USB sticks/HDD in the dock are recognised, LAN is not Gbits but 20 Mbps, HDMI/DP doesn't work. So either your dock is out of order like I had it, or the laptop is. If you have another PC/laptop that "works", you can test the dock with it. According to your text, it seems that the dock doesn't work with any of your computers, so the dock has a problem. Or, assuming the dock is in order, then there would be a compatibility problem.