Frank Davis

hello! I have i big problem that i have try to fix but not sucessed... I have a Audi A5 3.0 (2008) and there is no sound from my speakers...the only sound i get is from the parking sensors... I have bought a second hand amp from ebay for 500£. Because my audi dealer told me that i had a broken amp, but when i went to them to remove the security codes they told me that this amp also was broken... So i went to a guy who works with electric and he checked the amp's and didnt find any problems...So now i woulder if any of you guys have any suggestions what may be the problem?