Reminds me about a cartoon I saw, years ago, which showed a half dozen white smocked scientists all deeply concerned and feverishly trying to fix an old cabinet sized computer that was simply unplugged. Don't feel bad, its a simple mistake that we've all made over the years. Whether its dropping a gas tank because the fuel gauge said 'empty' and found that it really was, or replacing an alternator and then finding out the 'charge' fuse was broken. Don't worry - you're in good company!