My W124 has a Blaupunkt Cassablanca CM62 stereo. These were OEM in early W140 and illuminate and look perfect in the W124. It's stopped working tonight. When the key is out of the ignition, the red LED flashes as per normal. When I start the engine, the red LED goes out as per usual but the radio doesn't come on. No sound and no illumination. Where do I start first? Thanks in advance for any help!