Greetings, this is common with the ls430 cd player, but first did you take the shipping lock off? this is done by inserting a small pointy thing into the hole at the bottom back area directly below the 'SHIP ' holes. this needs to be done as you power the unit up ie when you have connected the power and turned on the ign, I found that the fault is the unit goes into ship lock after cds of thicker size have been inserted into the unit and cause a sensor problem. hope this helps.