I have a Sony mini hifi which had the same message, "PUSH POWER PROTECT". Took it to Sony Service Centre next to Simmers found out it had shorted six capacitors... They charged 6K for the repair, the machine's still awesome to date but their customer skills were shit.
Have a Sony and same thing happened to me. Only to realise that one of the wires to the surround speaker wasn't connected properly and had short circuited. Corrected the mistake. Switched off then on. Problem was solved