I checked all connections and the fuse, they are good. Unplug the harness from the back of the unit and check for ground and power were also good, but the unit still won't turned on. What might be the problem..?
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Have you checked the fuse at the back of the head unit. You will need to extract the head unit from the slot. There is a small blade fuse near to where the wiring harness connects to the back of the unit. Check it to see if it has blown. It normally is a red 10amp fuse. Also check your main fuse board.
did you use a wire harness adapter or did you connect the wires from the radio directly to the wires in the car? do you have a computer safe test light or a digital vom meter? do not use a conventional test light in this car or an analogue meter to check for power
Please let me know what kind of car you have (year/make/model). Check the fuse in the back of the radio, it should be right there when you unplug the wire harness going into the back. If it's blown, you probably have a shorted speaker. Also check the fuse boxes in the car, under the dash and under the hood. If this does not help, give me some details about the problem. There are many things that can keep a cd player from turning on, I just gave you the things it most likely is.