iPhone 12 apple logo keeps flashing, phone is not turning on

Hey there maria_key,

Thanks for reaching out to the Apple Support Communities. We understand you're having issues with your iPhone not turning on, and only showing the Apple logo. We'd be happy to help.

To get started, give the steps listed in the following resource a try that can help with troubleshooting this specific issue: If your iPhone won't turn on or is frozen - Apple Support

Start with the steps at the top of the page under the "If your screen is black or frozen" section, and if the issue persists then we'd recommend trying to restore the device using the following steps under the "If your iPhone turns on but gets stuck during start up" section.

When following the steps to restore your device, and when you get to step 5, be sure to choose Update and not Restore. This will allow iTunes or Finder to try and reinstall the iOS software on your device without removing any user data.

We hope that's able to help.

Take care.