What is your machine specs? What is your video card? Is it capable of HDMI connection? That is the preferred interface.
Check your video card control program (i.e. CCC for ATI, Nvidia) to make sure it recognize your TV.
If you have dual DVI output connect the TV to the other DVI. Set your display to enable extended Windows desktop. That will enable you to debug. The control software of your video card should indicate Sony Bravia on the second DVI port.