I upgraded my iPhone 4 to ios 7.4 and the screen stopped working i can not use the phone How to fix it ?.

I upgraded my iPhone 4 to ios 7.4 and the screen stopped working i can not use the phone How to fix it ?.

Hold the HOME and SLEEP buttons at the same time until an Apple logo appears. If nothing has happened after holding for 30 seconds charge the phone for 15 minutes with the wall adapter and try again.

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