I have a Verizon iPhone 5, running beta 3 and it just won't turn on. It was at about 90% battery, no physical impact, I picked it up to use it and it was dead, unresponsive. Plugged it in and nadda. Held
hold down the power/sleep button and home button together until you see the white Apple logo and just let go.
Went through this many times Hai?