I have a 2000 Honda Civic and just replaced the factory stereo with a new deck. After plugging everything back in I tested the new deck and everything seemed to work fine, including the front and rear speakers. I was about to screw in the panels but then I remembered that I had forgotten to replace 4 screws need to secure the stereo assembly. This is where the problem occurred. I unplugged the lighter to gain access to replace the leftover screws. When I plugged the lighter back in and tested the deck, the speakers no longer worked! I still got power to the head unit but for some reason I lost all sound. What might be the problem? Any help is appreciated.