After market stereo install
 

So I went ahead and put I'm aftermarket stereo in it and with no luck, no sound did a little found the factory amp in it in the trunk. I didn't want bypass wanted to buy the plug and couldn't find one in store had to order it.. so put the stock stereo back in and now car wont even turn over.. security light comes on, so Disconnected the stock deck and car fires right up.. why would this car not recognized the stereo that I just pulled out it?? Do I need to reprogram something we're reset something??