Enrico320e

Hi all , I'm looking for some help with a problem i'm experiencing with my 2002 mercedes benz clk430 convertible the radio comes on but no sound , I checked the fuses under the hood, side of the driver dash , fuse box in the trunk, I disconnected the CD player nothing still no sound , I re-connected the CD player wires put it back together and still no sound.. It powers on and everything , please if anyone has experienced this problem and found the solution please help me I would really appreciate it thank you
Rico