Has anybody put their iPhone 4 into airplane mode and then it turned itself off, and now won't turn on? No matter what I try it won't turn back on. I have tried to reboot (Home button and sleep/wake button for 10-15 seconds) I have tried the obvious holding the Sleep/Wake button to turn it on. I have also tried plugin it in to the computer, wall charger, and even an iHome stereo charger. Nothing will turn this thing on.