Currently Being ModeratedMay 7, 2012 7:01 PM (in response to shona from md)
Basic troubleshooting steps clearly outlined in the User Guide are restart, reset, restore from backup, restore as new device.
If you have gone through ALL the above steps and are still having problems, then you'll need to bring your phone into Apple for evaluation.
Currently Being ModeratedMay 16, 2012 8:15 PM (in response to shona from md)
OK... mine just did the exact same thing! My ex-husband used to work for Apple and he gave me the fix... Here is the deal... hold down the top (power) button and the lower button (home) button for at least 10 seconds - AT THE SAME TIME!!! It worked for me. Good luck!