you are looking at a Denon MC 4000 DJ controller Serato 2-channel or deck for parts or repair only. the item was working as normal but one day it didn't start up. it's the PCB or ignition board I had it tested at a shop it can be repaired but the part is no longer available from Denon what could be sourced elsewhere if you're capable of that. everything did function correctly on it when it stopped working. thank you for looking.