I recently bought a sub woofer system and an amplifier from London to boost the sound system of my 2006 Mercedes Benz CLS 500. What a mistake. I drove the car to a workshop myself with the intention of fitting these items, to my regret, the entire system has been spoilt in the process. Now, when you power up the radio system, it flashes the mercedes benz logo and instead of initialising to the full menu, it just switches itself off immediately, no sound, no menu, nothing. Siena, any help or from anyone else?