Why Doesn't My Car Stereo Work

I just had my truck detailed now my stereo doesn't work. The sourc button doesn't work, off button doesn't work, I have to eject cd and reinsert for it to play. Only some buttons work. I am not a technical guy. I just bought this truck with this cd player. It had a DVD player but the monitor didn't come with it. There is still the player under the rear seat. All I want is to listen to a single cd in the main deck and listen to radio stations. I tried the reset button behind the face with no changes. the detailer has no idea what happened and he is looking into the problem also. Please tell me what I should do. Thank you, Rob