Dell XPS Notebook Dual Monitor /Docking Problem

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I have a Dell XPS 1710 (WinXP) that runs dual monitors while in a
docking station.  Dual monitor works great.  However, when I un-dock
the laptop and fire it back up as a stand-alone laptop, 90% of the
time no video appears on the laptop's screen.  The PC is working but
no video.  I have to power it down and reboot.  When I do, windows
comes up and the video color setting is very low (like 4-bit) and
looks like a Jimi Hendrix acid trip.  Once I reset my color to the
highest (32-bit) everything is fine.

I've tried fiddeling with the CRT/LCD buttons to no avail.

Anybody know what's going on?

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