Hello, I’ve used all the guides online but nothing seems to work, none of the button work, so I can’t turn it off or do anything of the sort. But sometimes it flickers with a white light on the side of the phone. So I’m looking if I can find a fix before looking for a technician. Thank you for your help in advance!
You are going to have to take it to a tech then. There is no way to know, without taking it apart, if the problem is just the display's connection or the display itself. It could even be something else. A tech would be the wiser choice.