After charging overnight, my iPhone 4S won't boot up. What can I do?
I have an older iPhone 4 that was working perfectly until this morning. I went to send a text and the screen was black. It charged all night and worked earlier today...now it won't do anything unless it's plugged in and won't make it past the black screen with the Apple logo...just keeps coming up, then going black again, then popping back up. I've tried restarting and holding down the home and power buttons...please help!