My radio recently went out - it does have power and does display the time and even the channels but no sound. I was told that it was probably my factory AMP that was bad and it would cost $400 to replace or I would have to buy a new radio and they would have to bypass the AMP. Is it true that Factory Radio in a Jeep will not work if the AMP is bad? I was thinking about buying an AMP on ebay. Please help!!! What should I do? I am not looking for some booming radio just music and don't want to spend alot of money on this.

Thanks