Hi all. Im not getting any sound at all from my hd5770 gc using its HDMI output into my tv! The analoge output in rear of pc works through speakers or headphones but no sound from HDMI ?? I ve checked all the basic stuff on my tv and pc and used troubleshooting but cant find anything wrong. My brother has a laptop with an HDMI output which we use with the tv without any problems so its something to do with my pc! Any thoughts? Thanks.