Why did my screen went black while on FB? Now it will turn on or re-boot, Why did my screen went black while on FB? Now it will turn on or re-boot

My phone was working fine this A.M. and while I was on FB page it went black. I have tried turning it on and re-boot and nothing, just a black screen. Can you help me. The nearest Apple store is 2.5 hours away. Thank you

Plug your device into the original charger & block in a wall outlet and leave it alone for a couple of hours. Then, while it is still plugged in, restart it by holding down the home button and the power button for 10-15 seconds until you see the Apple, then let go.

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