Nety: yip with sbiddle on this. You should not need to set anything up. HDMI is able to tell the video card what it can handle. Just unplug the VGA, plug in the HDMI and boot.
Like I said at the beginning of the thread, just make sure you have the TV on and selected to its HDMI input before you boot the PC up. If no other video connections are set up then the PC should poll the HDMI socket, find a TV there ready to handshake, and away you go. That's certainly how mine works.