Black screen of death occurred on my iphone 4?

Few days back i bought a new iPhone 4 and today black screen of death occurred on my iPhone. Now my iPhone is fine. I pressed the lock button and the home screen button together. I just want to know why the black screen of death occurred as i didn't drop it or put it in water and it is new as well. Is it normal? Is my new iPhone fine?

Don't worry it's fine. There's nothing a hard reset can't solve if anything else happens

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