There's something here that doesn't sound quite right. A "No signal" is what the TV displays when it doesn't see your cable box. Comcast shows a different message "You have not subscribed to this service" when trying to access high def channels and you have not subscribed to high definition service. Your situation sounds more like you lost your HDMI input jacks that I mentioned happened to me, and if you search the net happens with some frequency. May we assume that you also reconnected your HDMI cable at both ends? You can also test the HDMI inputs with a DVD player if you have one.
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