Not sure if the OP is still watching this thread or got it fixed, but I have 2 9550 cards as well as several other ati card. Ranging from my old 8500's, to my 2600xt, they all have theater mode so far as I can remember. I also remember that on more than one occation, I had to update/change drivers (catylist control center) to get the option avalable (could be I was just looking in the wrong place on some versions). If you can get the secont display (tv) into theatre mode, and and all video (sorry, dont know about slide shows), will automatically be sent full screen to the tv (secondary display). You can be web surfing or photoshoping or whatever you want with the video on top, in the background, or minimised on the monitor, and the video will be sent full screen to the tv. It works great for me to work on the computer in the bedroom while the kids watch tv (played on the computer), so I can supervise them and still work.