When you press Start / Eject PC on your docked Windows 2000 laptop, you receive:

You cannot eject your computer because one of the devices in the docking station, Display adapter, cannot be stopped right now. Try closing all applications and ejecting the computer again later.

If you have an additional display adapter installed in your docking station, you cannot use Eject PC.

The only way to undock is to Shutdown and use cold undocking.