Bootcamp Windows won't display without power cable attached

Hey guys, I have a strange problem and I don't know when it first arose.
I have a MacBook Pro which I use a VGA adapter to have 2 monitors running (my laptop screen and the extra monitor). This runs fine in OSX.
When I try to use the same set up in Windows I get weird results. It works fine while I have the power cable plugged in. When I remove the power cable only the secondary monitor shows and the laptop's monitor powers down. If I don't have my VGA cable plugged in and try to run Windows with just my laptop screen, I can only get the screen to display while the power cable is in. As soon as it remove the power cable, my laptop's monitor powers off. It comes back on when I reattach the power cable. When I have the power cable in and the VGA cable in, both monitors display fine
Does anyone have any idea what this is about? I reckon its something to do with starting to use a 2nd monitor on OSX, but I have no idea where to start.
Thanks in advance!

Since I heard other people had DVI
connections working, I tried that, and it worked.
Then, I plugged an analog monitor back into it, and
that worked too! Seems like it just needed a kick
(weird).
I too have tried all manner of combinations and restarts to get Windows XP output to SVGA data projector. I get picture during windows start up and then it disappears - never to return once XP has loaded.
What order do you use to link up all the bits? is there a way to toggle external monitor in XP via boot camp on a Macbook Pro?
macbook pro   Mac OS X (10.4.6)   2 GHz, 2 GB, 7200rpm

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