Hello, I am a newbie. I have a CD3.5 which has the ERR display when attempting to play a track. I have removed the lid and removed the disc drive from the player and removed the disc drive pcb and plugged the drive back into the motherboard and pressed play. The laser shows its red light and tries to focus but no disc is present. I have a new puck but all the disc manages to do is rotate about 130 degrees then stops and shows the ERR display. With the laser light present, I am temped to think it is OK, but is it? I would appreciate some recommendations as to its fault origins. Also, am I missing something like perhaps a micro switch being open because I have removed the disc drive housing from the player?