Car stereo wont work?

First off, I apoligize if I posted this in the worng section, but i didnt know anywhere else to post it. Ok the my problem is with the head unit. its the factory unit, and it doenst start at all, and neither does it show the time. Along with the stereo, neither does the light when you open the door work, and the lights on the sun blocker thing. I replaced the fuses for all of these accessories, but that didnt do anything, they still wont work. The ac works, the signals work, just the stereo and these lights dont work? what could be the problem?. I think they stoped working when i tried to replace the light bulb in the trunk. what happend was when i was tryin to twist it and pull it off, the bulb just broke off from the metal part, and the metal part was stuck inside. thanks a lot, I appreciate it, and have a good day.