Read through the Owner's manual, see if it details anything that would explain this.
Are you sure a DVD is NOT still in the loader? See if you can eject any DVD/CD still left in the loader.
If you have the steering wheel controls, try to change modes with the steering wheel control. After putting in my Hands Free Kit, a couple of times my disc/aux mode button wouldn't change modes, I used the steering wheel button and it changed, and it hasn't happen since then.
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