Car Stereos: no sound, magnatude, factory radio

Question
i put an after market amp in to my rear speakers and i am not getting any sound i checked amp and rca's and i still have no sound i am useing a factory radio can you please help me

Answer
Joe, There are a magnatude of things that may be the problem.  I would double check and be sure there is a good tight ground secured to the car body.  If it still doesn't work you may need to take it to a repair shop and see if it is still fundtioning properly.  Hope this helps, Scott