The Protect error message is usually caused by a speaker or amplifier problem.
Try removing all speaker connections from the home theatre system, then try powering on the system again.
If you still get the 'Protect' error message when all speakers have been removed, then the amplifier in the system has a fault and it will require a repair.
If it turns on ok, with no error message, then one of the speakers or the speaker wiring is faulty - connect the speakers one by one until the fault returns and you have found the source of the problem.
If you require any additional information, please do not hesitate to let me know.
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Even when the speakers are disconnected?