Radeon 8500LE and TV-out problem

Dear All,

I try to get a hometheater setup using a PC. TV-out to a widescreen TV and
VGA-out to a 9" monochrome monitor (to control some window things)
If i test the setup with a normal 15" VGA monitor it works (i get both TV and
VGA image). VGA is set to 640x480x16 60Hz.
Everything is connected at startup of PC!
If i connect the 9" monitor i keep picture on TV and VGA until windows switches
from a text to a graphics screen (ATI VGA driver init ?) then both TV and VGA
go black. Windows load completely (i can press ALT-F4 + S + ENTER to shutdown)
Why is wat is connected to the VGA port of importance to the TV-out ?
The 15" VGA will supply DCC info and the 9" not, but i have selected in Windows
a 'standard 640x480' display instead of 'plug and play'.
Wat gives, anybody?

(you can understand that i have rather a 9" next to my TV then a big 15" )

Frans

Setup:
Celeron 1000Mhz
160MB of PC100
MSI-6163 Slot 1 motherboard (yes i know, don't laugh )
Radeon 8500LE
Catalyst V3.7
Windows 98SE