Start up - lights only flash cycle top left- bottom right

sometimes wen starting my x1800 it boots correctly and opperates fine, but other times the mixer will boot- but only go into a sequence where ALL lights starting in the top left hand corner moving to bottom right hand- illuminate and then disappear over and over.

ive checked all connections are correct and media players function properly, cables, links, EVERYTHING- anyone experience simillar?

Check new 1.2 firmware, I think they fixed that.

tried updating firmware a few times and it just freezes

What firmware is it now. If it’s really old, perhaps you first need to go to the previous 1.1.1.

called denon and they said its a fault internally so no firmware update will help - had to send it off to them for repair