Just happened to my phone last night, I can feel the nudge when I hold the On/Off button, and the volume button nudge too when I tried to turn up to max volume and silence, only that the screen is completely pitch black, can't seem to turn it on whatever I press. So since I can't turn off and on the phone again, I was going to take out the SIM card to put into another phone for temporary use. And for some reason, once the SIM card is out, the screen is back on again! Might worth a try if you are desparate.
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