OK, I was trying to establish if it was a new purchase of which you may not have had a previous opportunity to check for correct operation. However that is not the case.
I have looked through the archives here and cannot find any precedent for your issue nor do I recall one.
It superficially looks like Puccini’s OS is not loading ( but see my new thought below). I had hoped that a rear panel switch off and reboot would have reset the machine and it would then behave as usual. With some other devices there is a combination of buttons that will force a reset like e.g. hold down both volume button and power button at the same time for 5 secs but sadly I am unaware of anything like that with dCS equipment.
Given the age of the Puccini and the unusual character of the issue and that it is not fixed by rebooting I think that this may need the attention of a dCS engineer. Are you in a country with a dCS distributor? I don’t know whether @James or @Bashcroft ( dCS engineers who sometimes contribute here) are able to offer assistance. Have you tried your dealer or local distributor for help or were they the specialists with no idea why this is happening?
Just before I leave I have had a new thought . Checking the User Manual the switch on display for Puccini shows the product name and dCS. Your picture shows the SACD logo instead of Puccini. If I recall from my days with Paganini correctly the SACD logo only appears when an SACD is loaded. Could you have left an SACD disc in the transport which may now be jamming it? Just a thought.