No offense, but it seems you are really either unlucky or don't know anything about car wiring. The best bet is to get it professionally done, but see if a mate can do it for free (assuming he knows how)
Hope this helps.
if it's hardwired into your factory wiring then you might have wired it wrong and cut the wrong wire, if it's using an adapter then its got nothing to do withe the radio itself, weather or not you either cut the wire while putting the radio in along a sharp corner or something is entirely possible