DJM-900 nxs digital input

Hey, I really hope someone can help me.

I have a Djm-900 nxs who has worked perfectly until now.

The digital input does not work. Channel 1,2 and 4 show light in the channel indicators when playing a track. But no sound comes out. You can screw trim up and down as it appears in the channel indicator but it does not affect the sound. You can not adjust the channel fader which affect the volume. There is always the same level. Master level can be screwed up and down, so it can be seen in the master indicator. But there are still no sound.

Channel 3 can play. But it appears neither on the channel or master indicator, and you can not screw up and down for either channel fader or master. But there can be screwed up and down with the trim button.

I have updated to the latest firmware.

Some ideas what the problem could be?