I have an HDTV and haven't puchased an HDMI cable yet. But my PS3 arrived today and I wanted to check it out anyway so I plugged the AV cable into the appropriate AV IN connectors, plugged in the AC power cord to the power outlet, turned on the console, and set up my TV source as AV. However, all I'm getting is "searching for signal." I've read the instructions many times and I'm not sure what I'm missing. Any help would be appreciated.