I was having the same problem. I read your question and did the following with success:
1. Reattached power cord and all speaker wires.
2. Held down RHYTHM AX until it did its reset thing(it beeped and blinked or something like that).
3. Pushed power button.
4. Hit or held RHYTHM AX button again while status protect was displayed.
It worked, try variations like that. I have to hit RHYTHM AX everytime I power on though.
Your question was solved my problem, hopefully it will help you out also.
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