I'm having problems with the following setup:

Dell Intel 1.0 GHz 512MB
Windows Media Center 2004
Radeon 9200SE plugged into my Toshiba 51H84 HDTV using a DVI to HDMI cable
Catalyst 5.1 (older drivers do not perform any differently)

When I try to run the TV as the primary screen, the computer goes into a
continuous re-boot loop. I have to disconnect the DVI output and connect the
TV through an RCA video cable.

I am able to boot up using the RCA video cable, and run the TV as both
primary (through RCA 800x600) and secondary (DVI-HDMI 720p) screen.

If I try to swap screens I.e. make the DVI output primary, both screens go
black, and the computer freezes. If I force a re-start, the computer goes
into a continuous re-boot loop again.

So, I have a DVI - HDMI connection to my TV, and it's apparently working,
just not as the primary.

Any help is appreciated.

Thanks!

Johnny