My phone randomly shut itself off - still had over 50% battery. Will not turn back on no matter what I do. Tried taking the battery out and back in, tried a different battery, tried taking SIM card out and in, tried charging for several hours (doesn't register that it's plugged into a charger tho). Have tried everything on every online forum I've been able to find - including holding the power and volume buttons to try to force a "factory reboot". Absolutely nothing has make the slightest change. Help!
