Can't get off Black screen

Accidentally turned the brightness off and I can't get it back to bright. I don't know if it's on or off because I held the power button so many times . So now what do I do ? I have tried holding the power button down for 30 seconds and the power and volume button down . Many times and nothing works

Bu soruyu yanıtla Ben de bu sorunu yaşıyorum

Bu iyi bir soru mu?

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