SOURCE: MY D630 LAPTOP DOES NOT WORK IN DOCKING STATION
When powering on the D630 from the Docking Station, press F2 to go into Setup. Scroll down to the Docking Section, and check the Dock device info for the status. If it shows undocked, then try changing the below settings to: Hot Undock, Enabled Silent, and Universal Connect Enabled. Save these settings. Make sure you update your BIOS to A16 from http://support.dell.com under drivers and downloads section. If still not recognized after this, check the dock port on the D630 for obstructions or burn markings on the pins. try cleaning with rubbing alcohol and qtip swab. I have seen a few cases like this and ultimately the motherboard was the issue and needed to be replaced.
SOURCE: USB ports in docking station stopped working suddenly
I was having the same problem - the USB ports seemed to have stopped working so I could not use the mouse, keyboard, or printer, even though the monitors and power could still operate through the docking station. Finally, I just unplugged the docking station for 30 seconds, plugged it back in, and everything resumed working. I was surprised it was that simple, but it's working for the moment.
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