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It should go dark when you put throne up to your face. That keeps it from getting to warm on your face. If you don't want it to go dark, you can turn the auto dim off in settings under display. It will use more battery, but it shouldn't go dim. Then that may be under another setting.
I think you tried to reboot it and than restore it. If that does not work you may need a trip to the Apple store or call Apple tech support.
The second way:ADDIN TIMERsoftwareinstallation, set upat 2 am,4:00,6:00,8:00and1:00automaticreboot. Further reading :The solution for Samsung impression screen turned black
Try to turn it off, remove the battery and sim card. then after a minute or 2 reinsert simcard and battery. If same thing happens, call your manufacturer or service provider to check warranty status of your phone... for replacement