I was texting on my IPhone 4 when I looked away, and when I looked back, it was frozen on the lock screen. I let it sit for a couple of minutes, but then it turned itself off and I think it restarted because the Apple logo came up, but then it disappeared and I haven't seen any signs of life since. I had at least 75% battery, and I tried to reset it with the home+lock screen at least half a dozen times, but to no avail. If anyone can help, it would be greatly appreciated.
Added (1). I plugged it into my computer and opened ITunes, but it didn't recognize my phone being there.
>>> My IPhone froze and turned off and won't turn back on?