See the information attached, and use the common sense, and logically. God bless youThe CD/DVD, has 2 switch one for open and another for to close. the swicth can be dust, dirty, or defective.Test the power switch for dirty, dust, or defective. The unity can be dissasembly, and make troubleshooting, diagnose.I can recommend you to go the repair shop. When the switch is NOT open they NOT send the signal to the SYSCON(CPU) or microcontroller.God bless you