Radio issue

[2003S]

So this morning, I start up the car, and the radio just displays "P O R S C H E".
No sound, nothing. I can turn it off, and the display goes black, but otherwise the buttons don't do anything. Turning the volume doesn't do anything, so it seems no power to the speakers - no hiss or anything.

Anyone have any idea what's going on? I didn't have time to go thought the fuse box and check fuses, but the fact that it has power makes me think it's not a fuse.