You've tried with a variety of different EQ Compressor presets, right? And it's always the same result? You don't hear any signal going through?
It would be good to try a complete system restore of your H9. You'll want to back up your presets before doing this because it will restore the H9 to its factory presets; you can save all of the presets on your H9 to a local preset list in H9 Control in the Preset List screen. To restore your H9 to its factory state, power it down and power it up again with the right footswitch and the big knob/dial thing pressed.