Audio Systems: Car sound problem???, random reason, car sound

Question
yeah it has an amp ready kit but their are no amps in the car?? can it be because of the alarm system???
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The text above is a follow-up to ...

-----Question-----
Hi my name is Yama,
I had a question about my car. Recently my speakers and audio have stopped working for some random reason??? My friend just puts the volume up a little bit and than the sound is completely gone. Afterwards i replaced everything in the back of the unit and rewired every single wire again and it still has done nothing. Everything works fine except for the speakers and the display works fine and all other parts work fine just have no sound and i checked the sound wiring everything is connected and wired correctly, but their is no sound????
-----Answer-----
your car may have an amplifier hidden somewhere, the fuse may have blown in this.  what is the year make and model of your vehicle?

Answer
some cars actually come with them already.  that is why I asked you the year make and model.  you may not ever know its there, they're usually an unmarked black box up iside the dash or under a seat or something like that.  its most likely not from the alarm system, those are pretty separate things, cant see how one would effect the other.
is your amp that you installed just runing the sub or runing the door speakers?
if not, do you believe your cd player runs the door speakers directly?  if so there's an easy test we can do for that.
let me know