I tried this last night using an HDMI -> DVI cable. No joy, same screen.
I tried all the different inputs on the Panasonic TV, and even tried using strait HDMI and HDMI->DVI together.
This may turn out to be an incompatibility with the Panasonic TV, but seeing as other HDMI sources work well with it, it seems it also has something to do with the Intel MOBO drivers/BIOS.
Any help is appreciated.
So it turns out all this is just a crappy HDMI chip on the Panasonic TV, I got the tv to display win7 but only if I connect a monitor to the DVI port while booting, then at some point the plasma kicks in and takes over, but it handels the overscan very poorly, and has other issues.
I will probably replace this TV.