I had bought a new stereo for my Dodge Neon, had installed it, and everything worked great for a couple days. Later my stereo was no longer getting power, I took it out to try to find out the problem. The power cable from the battery to the stereo is no longer intact. The little metal pin in the middle(no, I don't know exactly what it's called) broke off! I have no idea how, or even where it is, all I know is that it's gone and I don't know what to do! Is this a replaceable car part? If so, where do I find a new part, or where would I take my car to get the best help and possible answers? Would it be better to take it to a mechanic or to a stereo installation shop?