3. Unable to power on

It is more complicated when you can not see what is happening, the most annoying problem ever. There is a number of reasons why the screen is still black, normally because of ROM or software. The important thing is that you have to make sure that your battery is not drained or low, so charge your phone first. Then press and hold the home button for 10 seconds and power on it again. On the other hand, you must go to retail stores for product warranty.

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