Hot Wire on Head Unit 86100-47231?

2013 Prius FIVE - Head Unit went from working/looking brand new to DEAD!

Fuse OK - Power to/from Fuse OK.

Hoped for an obvious loose wire - I see none.

My wife started out and just a black screen.

Nothing seems to work from the head unit (if I call it the right name?)

Radio, GPS, DVD (even the screen drop-down for the DVD), nothing at all on the unit seems to have power.

So, I am looking for the power source for the unit - hoping I can find an easy (ier) fix.

Thanks