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My phone shows an exclamation mark in a triangle on a black screen
Your phone may display an exclamation mark in a triangle on a black screen. This happens when the Recovery mode image is corrupt or missing.

You can restart the phone using the hardware buttons. Press and hold the VOLUME UP and POWER buttons for up to two minutes or until the phone vibrates.

You can also boot to the Bootloader to restart the phone. Follow these steps:
  1. Press and hold the VOLUME DOWN and POWER buttons for up to two minutes or until the phone vibrates.
  2. Press VOLUME DOWN to go to Reboot.
  3. Press the POWER button.
Power cycling your phone may help to solve the issue. Follow these steps:
  1. Press and hold the POWER button until the Phone Options appear.
  2. Tap Power Off and wait for the phone to fully turn off.
  3. Wait for a few moments, and then turn the phone on by pressing and holding the POWER button.

A factory data reset can also resolve some software issues.

Note: Factory Reset Protection may be enabled. Before taking the following steps, ensure you have the login information of the main Google account that is logged into the phone or you will be unable to use the phone.
  1. Go to Settings, and then tap Backup & reset.
  2. Tap Factory data reset or Reset phone.
  3. Tap Reset phone or OK.
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