Unable to turn on my iPhone 15 Pro Max after turning it off

SMcA1111 wrote:

I switched my new phone off last night and now I can't turn it on. I tried the reset hold up volume, then down volume and the side bar, nothing. And the usual way both side bar and volume. It was working great before I switched it off last night. Any ideas? And I am going on holidays in 2 days and can't sent it anywhere. Help please :0

PLug phone to power source wait 10 minutes and then do the force restart.

This article might help too:

If your iPhone won't turn on or is frozen - Apple Support