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Are you using an in-line fuse? If so check that, but more than likely if your cd player isn't working also it probably is one of your regular fuse, Have you checked the fuses under your hood, I don't know what car you have but you might have a fuse there that's for your radioi thought i remembered there being a fuse on the back, but i pulled it out and there isnt one.
when i take my faceplate off, the red security light behind the faceplate still flashes.