A couple of days ago, just when the freezing at night season started (in case it might be relevant), I noticed that when I open the car, the radio/nav/phone/etc. screen in the middle remains blank, whereas it usually shows the time. No change when pressing any button there, or when trying opening/starting the car again half a day later (it used to fix the going-mute-while-playing-an-mp3 issue). The car otherwise works normally, the small dashboard screen shows what it needs to.
I checked the fuse (no 108 in the manual, in case it helps) but it was ok.
Is there anything I can quickly do/check myself before taking it to the garage?
Thanks in advance!