QQ.
Shutdown tonight and the console simply put the screen black and the console power button pulsed and the controller stayed on.
I waited a minute and then pressed the power button and it just played a little tune.
I waited a little longer then held the power button down. It shutdown.
I turned it on, and all seems fine. Played a few games for a bit and then shutdown fine. Messed about a bit with remote play and did a few shutdowns all good.
In hindsight...was it simply doing some cache clear or an update? Only got Forza, Minecraft and halo installed.
Had the console for 6 days.