Hi, iv got a 2000 bmw 728i and the television in it works fine, except there is no audio. Tried the tape and cd player and theres still no audio. The sat nav wont load up when you click it, just says please wait for ages. When you try a few steering controls, on the speedo a display message of "INSERT CARD!" comes up. Does anyone know what this means? where do i insert this card and what is this caRD? thanks