My Droid 1 won't charge on the stock wall charger (3 tried), but charges on USB, car adapter and a different Motorola micro-USB charger (one without a removable cable). After it failed to charge with the original charger, I started using USB and car, and got the other non-stock Motorola charger (which works, but slowly). I recently bought two original stock chargers from Amazon. Neither will charge the phone. The cables and connection at the phone are good- plugging the USB into the computer works fine. I assume it has something to do with the phone sensing circuit to find if it's plugged into a computer or a wall charger. Ideas? Or do I need to invoke my insurance?