i have the same problem here. I have DirectV and had a ghigh def receiver with HDMI running from it. I had to get an upgrade dish and receiver in order to receive the local channels in HD. When I connected the HDMI cord it started blinking on and off. The technician who installed the equipment said the cord was defective. I could not understand that when it worked just fine before. I am going to get another HDMI cord and if this does not work I will contact the provider.

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