My iphone 14 pro max screen went black?

(1) Try and Force Restart your iPhone EXACTLY as shown below and see whether that resolves the issue:

• Press and quickly release Volume UP button
• Press and quickly release Volume DOWN button
• Press and Hold the SIDE button until an Apple logo appears and then release the Side button (Can take up to 20 seconds. (DO NOT release Side Button when invited to Slide Power OFF). 

(2) If the above does not work then - Follow the instructions in this article by Apple ➔ If your iPhone is Non-Responsive or Frozen and see if that helps.

Axel F.

moher1996 wrote:

How do I fix?

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

moher1996 Said:

"My iphone 14 pro max screen went black?: How do I fix?"

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Troubleshooting Being Stuck in a Boot Loop:

Your iPhone might be stuck in a boot loop. This typically happens when an update install stalls.  So, refer to my User Tip: How to Fix an iPhone in a Boot Loop - Apple Support

This resets the iPhone but doesn’t fix the issue with the black screen.