I recently purchased a refurbished Magnavox MDR 513 recorder and it seems to work fine however it will not connect to to my flat screen TV utilizing the HDMI cable. My TV can not detect a signal coming from the unit and the HDMI button on the remote does not seem to do anything. I connected my son's xbox 360 to the TV using the HDMI cable and it works fine. Presently I am using the RCA cables to connect the recorder to the TV and everything seems OK. Would like to get HDMI to work to see if there really is a picture quality difference. I receive my TV signal through an outdoor antenna. Any suggestion?