ati radeon 9660 tv out

ATI Radeon 9660 and TV out

Hi Folks
I have installed build 5308 (Beta 2) of vista onto a test system with an ATI Radeon 9660 graphics card with latest drivers from ATI.
The issue is, when the PC is switched on I get output to both TV and Monitor (Mirrored) as soon as Vista hits the graphical interface I loose TV output. If I disconnect the monitor and boot only with TV connected, again I loose TV output as soon as it hits the graphical user interface.
Regardless of resolution and setting (That I have tried!) in the Catalyst drivers once Vista hits the graphical interface I can not get any output to TV.
This is a test Media Centre PC so TV out is quite important ;-)
I am using composite out.
Any ideas?
Cheers SuperPlay

Windows Vista

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