First update any drivers for your dell.
www.support.dell.com
Is the dock a dell dock, or a universal Dock?
the drivers may need updating.
Some times when you plug a dock in, and turn it on, they will load them into the drivers and when you unplug it, it gets confused and when you boot it up it has to re-install the original drivers and does this while its booting.
This happens alot with the GX620 desktops. If you pull a USB keyboard out while its off and plug it back into a different USB port and tun it on. It wont work right away.
We end up having to let it sit at the login screen for a while till it reloads the drivers to the new USB port.
You will know if yours is doing this as the Hard drive light will be flickering and running.
Try booting it up and letting it load windows and waiting a few minutes.
is there power to the docking station? it could be that the docking station is faulty. if you plug in the accessory mouse/keyboard directly into USB it works right? it could be the pin array at the bottom of the laptop is dirty, corroded or something. have you checked the row of pins under the bottom of the laptop? where it meets the docking station, maybe it has taken some damage. does the computer actually boot/power on when on the Dock? or nothing? that suggests the power on the D/S is kaput.
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