aftermarket stereo

Hi folks! I've searched high and low on the internet for this and cant find an answer. Yesterday I brought home an 07 Suburban LTZ (pretty high mileage) and its great (so far) but I was looking at upgrading the head unit to something with Apple Car Play. I have used Apple Car Play before and...

Car: 2001 Z24 Cavalier Backstory: I installed an aftermarket stereo in my wifes car a few days ago. Upon finishing install, the stereo worked great but the car would not turn over. When attempting to start, I hear a beep coming from the dash and the fuel pump does sound like it is building...