i just wired my head unit in only to find out it wasnt working.. i checked the radio fuse and it was blown so i replaced it.. the head unit would not turn onbut when i hit the cd eject button u can hear it working.. so i rewired it but now the cd eject motor isnt even working.. its really pissing me off so let me know anything you can..

problem 2.. little more serious..
i go to start the car but instead a loud 'pop' comes from the battery and the car power shuts off.. after figiding with the negative cable, power returns.. but when i start the car, the needle wont even jump past 1k an sits down at 200-300 rpms.. i dont know if this is falty o2 sensor, fuel pump, or throttle body..