ok i have a PS3, everything was working fine, i could play games and everything. however few days ago my friend came over and he had a HD cable so i decided to use it (for the first time on my HD tv) and we play PS3 on HD and everything worked. however when i switched it back to AV multiout.(its usually on AV5) nothing comes up, just a blank screen. why doesnt the PS3 menu show? and there is no sound either. i dont have that HD cable anymore so i cant switch back. wats wrong?