That's the next step I would try before obtaining any refund, etc.
I just got this HDTV used. It turns on with a blue screen when on tv channels and a dark screen for any input channels. I've tried hooking up my ps3 and Blu-ray player with hdmi, rgb and those red-yellow-white cables but I get no change in any configuration. Restarted the tv.... Since it turns on and displays the blue screen fine I'm at a loss for what could be wrong.