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Thinking about what you have going on, I would plug in a battery and check the + and - wires going from the PDB to the ESC's for battery voltage, it could be that something has happened to the PDB. It is odd that you get no startup tones at all from the quad when you plug in a battery, even if the FC wasn't working or being seen by the ESC's you should still get the first 3 tones if battery voltage is making it to the ESC's.
