how can i fix my vdo cdr 500?

recently got a vauxhall v .removed panel face from rc player. when i have inserted back i get safe mode in display screen on dashboard was working fine before i removed it .now i can't get it working again tried pressing the a/s button and the on off switch in different ways . nothing happening, all the buttons don't seem to work as if the machine was dead , but i inserted cd went in fine but now it won't come out also when i have my lights on it all lights up in the background any help would be great regards barry