Had a problem with my 3g iphone 3g today, had been using it over lunch and after sending a text message had locked the screen, a few minutes later felt it vibrate to let me know a new message had come in, so went to unlock the screen and was presented with just a black screen displaying only the signal strength-date-time-battery life and nothing else.
Thought at first I’d broken it, I tried pressing the sleep/wake button on the front of the phone, but this didn’t change anything next I tried pressing the lock button again to no avail, so there I am with a blank / black screen on my iphone thinking its now completely buggered, with no access to a computer that I could reset it on either.
Anyway being the UberGeek I am I don’t take defeat sitting down, so got on a PC and googled the iphone’s symptoms and came across this fix (see below), well its actually a iphone reset,which thankfully worked, so now I am no longer blank/black screened J
So if the same happens
Just follow this easy guide and your screen can be revived !
Press and hold down the Sleep/Wake button and Home button at the same time for a least 10-15 seconds. This will cause the screen to clear out and then it should display the Apple Logo on the black background.
Once the Apple logo appears it means that the reset is complete and the iphone will restart and your back in touch with the online world . . simple as