AVS Special Member
Join Date: Jan 2005
Location: Montreal, Canada
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If the cable box is connected to the CBL/SAT HDMI input, I assume you selected that input on the receiver by pressing the CBL/SAT button on the remote? On the receiver front panel you should see a little red arrow showing that CBL/SAT is the current input, and HDMI should light up in red on the front panel when there's an HDMI signal on the current input.
If you can't get that input working, try connecting to a different HDMI input on the receiver and select that one.
If it still doesn't work, make sure you rule out a bad cable, and if you have any other device with an HDMI output (e.g. DVD or Blu-ray player), try that instead of the cable box. You know the cable from receiver to TV is a good one because it shows the menu, so you can test any HDMI cable by using it between receiver and TV.