I run a Sony HDTV to my VAIO laptop video and audio, works fine. Except it defaults to monitor order of 1-2 and resets after every boot or profound desktop change.
Can a Registry tweak be set to change the order to 2-1?
I found this. It seems logical. Credit goes to Fleece per this thread....
This is assuming that you are using NVIDIA drivers. If this isn't the case, then Microsoft Answer's "Dual Display Numbering in Vista" thread has four other methods. Check it out.