JVC PD-42WV74 Help!!!!!

My plasma screen does not have audio or video. When I power on the receiver all three green LED's on the back of the tv come on. After a couple of seconds two green LED's turn off and the red LED8004 turns on. The only way I can get the RED LED from not coming on is by unplugging the DVI system cable, but still no picture or audio. Any help is appreciated!!!!!