No login dialog after Running VNC

This is a long one.
I have a system running Windows 2000 pro and using one of RealVNC 4 or
Radmin. The system boots normally with the monitor, keyboard, mouse connected
and VNC starting as a service. VNC works, I can connect to the system do
what I need to, log out and discconect. I can go back to the system and use
it normaly using the connected monitor, kb, mouse with no problem. If I
disconnect the monitor, keyboard and mouse. Boot the system, connect with
VNC, the system connects and functions as expected. But if i go back and
reconnect the monitor, kb, and mouse and reboot I get no display. It looks as
though It's booting normally. I get the bios post, Windows boots, the windows
spash screen appears and when I'd expect to see it change to the windows
logon dialog it goes blank and the video signal drops. If I boot in safe
mode and uninstall the display addapter and rediscover/install it again and
reboot I get the logon screen . I've searched the groups and Knoledge base
with no useful results.
Any suggestions would be appretiated.
Dan D.
.

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