standard stereo problem

ive got a problem with my standard head unit out of my mk1 octavia VRS,

the display works fine in the day but i can see it at night as its not lit up, is this just a fuse in the back or a more dificult fault or does it have controls to turn it down which is why i cant see it at night?

also does the standard 6 disk boot changer play copied disks as ive only tried it with some copies i have but it dosnt seem to want to work, its all connected properly too as when you press the cd button the display changes to disk1