anyone might know what the problem might be? previous owner had a aftermarket sub installed, subs were removed from the truck and i've disconnected all the wires left inside the truck. FM, XM, AM, Tape works fine but just everytime when i insert the CD to the headunit, the whole system shuts off, i had to shut off the ignition and turn it back on to get the radio work again, anyone here who had experience or might know what the problem might be, please help~ thanks in advance