I have a Gateway NV58 Laptop and it has an hdmi port. I tried it to connect it to my tv to watch a movie but theres no sound coming out. Only video is being displayed on the Tv. No sound coming out of my speakers. However there is sound coming out of my laptop speakers. My sound system is a Sutherland St-90 and my tv is a 42" LCD from samsung. Any help would be appreciated.