HT-S5500 Wii Connection not working

Hello - I am attempting to connect my Wii to my HT-S5500 and am having difficulty: I have audio but no video, just blue screen. I have ensured that the composite plugs are connected to the appropriate locations (Yellow-Yellow, Re-Red, White-White). I have set the HDMI Input for Game to blank. I set the Digital Audio to blank. Since I am not using component, I have set this to blank as well and I am not getting any viedo. I have also tried connecting a separate component plug to Monitor Out on my receiver and Video In on my TV. Still no luck. Thank you all very much for your help.