Hi all, I have the G2 (Sprint) and kept it on vibrate most of the time. 3 days ago, I received a notification - it vibrated & the screen lit up and immediately shut off! The battery had over half charge, but I haven't been able to get it to come back on or acknowledge being on a charger. It won't do anything! I took the back off, per these instructions, but have no idea what to look for that could be the issue. My son seems to think that the vibration worked a connection lose somewhere… HELP! Thanks.