So... have you thought to pull your newly installed CD player back out and
look to see what you may have dislodged/disconnected/or otherwise effected
when you installed the unit? The first step in troubleshooting a situation
like this is to undo what you previously did.
How did you tie your new CD player in? How did you get power, etc. You
really need to look at your installation.
Beyond that, or after that if you are still having problems it will be
necessary for you to provide your car information. Things like make,
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