ok all, let me start off by saying my monitor is a full HD 1080P flat screen t.v. When the tech was out here 3 weeks ago to upgrade to a hopper he offered to hook it up to my monitor and I said no, now I am kicking myself. So I go out and buy a 25ft RGB to D-Sub cable, connect if from my receiver to my monitor and I get picture, but no sound. I shut down my P.C. made sure the speakers are connected to the t.v. still no sound. Ok ol wise and knowledgeable people, what am I missing? please any suggestions would be greatly appreciated