When I try to turn off my iPhone nothing happens. I hold the power button down, but the turn off slider doesn't appear anymore. How do I solve this? Is there any key combination to force it to turn off?
Do you have a protective film on the face of the phone? If so, take it off. I was having the same problems. My wife took off the clear protective plastic on the glass because she thought it was too scratched up. Voila, no more problems turning off the phone.