My iPhone 14 i black this am and will not start

Try a "forced" restart of your 14, using these gestures:

Press and quickly release the volume up button, press and quickly release the volume down button, then press and hold the side (power) button. Only when the Apple logo appears (it might take 10-20 seconds), release that button (ignore all other screens that might appear, the one with the "slider" to turn the device off included).

If the issue persists, since your iPhone is covered by warranty, I suggest that you make an appointment (*) and have your device inspected at an Apple Store or AASP (Apple Authorized Service Provider) among this list:--> Apple – Location Selector. After checking it out, they'll give you all the available options.

Regards

Giulio

(*) You can do it:

• Online:--> Genius Bar Reservation and Apple Support Options - Apple;
• Contacting a local Apple Store or AASP among the list provided above;
• Using the "Apple Store" app, available and downloadable from AppStore.

You can try and do a hard reset on it. It will not remove any data from the phone. Here is how to do this:

1. Press Volume Up Quickly
2. Press Volume Down Quickly
3. Press and Hold the Power Button, and continue to hold if you see a power slider ignore it and continue to hold. Once you see the Apple Logo you can release the power button and let the phone continue to boot.

My pleasure :)