I got to chat with Caleb in PS Audio service. Based on watching a video of the symptoms he noted that the P20 sometimes remembers the event where it last shut down. Thus a restart or restart with the blue front panel standby button will keep it from the next step in the boot up cycle.
The key after initial initialization screen it goes dark. He said wait until you hear another solenoid click about 15 to seconds later. After one hears that click. Press and release the front panel standby button. This in turn over rides the protection mode memory and unit will power up.
That cured my issue. It is curious that after dozens of protection modes in the past four years . This is the first time I encountered this phenomenon.
Thanks Kudos to Caleb and PS Audio Service Department!