No Power Button Fix for iPhone X, iPhone 11 and iPhone 12
If your iPhone X, iPhone 11 or iPhone 12 are stuck with no way to power them off and you tried everything and even plugging in the iPhone into a Mac with a lightning cable, have no fear there is an alternative way to restart the phone and make the glitch go away.
This video explains and walk you through how to fix the no power button glitch with iPhones released after iPhone X,
Press volume UP the quickly press volume DOWN and then quickly press and this time hold down the Screen LOCK button.
This gives an alternative way to reposer the phone besides the hold down volume up and screen lock for 3 second.