Hey, I hope someone has some insight on this. My friend installed a new head unit into my car while I was away. When I got back, it doesn't work. He said I had to register it for it to work,.... Which im preety sure is untrue. Now the wierd thing is when I turn my car on it makes a noise like the CD player is moving around, but the face never has any power to it. I would ask my friend wtf he did wrong and fix it, but hes in jail for a little while.......... so does anyone have any thoughts??? Thanks in advance!