HT201337: Remove or switch the SIM card in your iPhone or iPad

Learn about Remove or switch the SIM card in your iPhone or iPad
ejiuwa
Level 1 (0 points)

Q: my iphone 4 powers on but does not show on the screen. What's the problem ?

my iphone 4 powers on but the screen is black and sometimes the screeen shows colored lines.

iPhone 4, iOS 6.1.2

Posted on Apr 29, 2014 8:32 PM