A factory data reset may help with a blank or frozen screen, apps crashing or freezing, keypad/touchscreen problems, can't hear, device making noises, can't make or receive calls, and device won't sync.
Caution:
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If the device is responsive and can be powered on, the preferred reset method should be performed.
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For devices with Android Device Protection turned on, it's imperative Google™ sign-in credentials are known prior to completing a factory reset with the device powered off. If credentials are unknown, do one of the following:
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Attempt to sign in with any Google account previously used on the device.
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Reset the password.
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Perform a factory data reset only if absolutely necessary as it removes all data including:
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Contacts
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Email accounts
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System and app data
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App settings
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Downloaded apps
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Media (Music, pictures and videos, etc.)
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Ensure the device is powered off.
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Press and hold the Volume Down button.

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While continuing to hold volume down, press and release the Power button but continue to hold volume down until the boot mode screen appears.

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From the Bootloader selection screen (image of an Android with Start), select RECOVERY MODE.
Utilize the volume buttons to cycle through the available options and the power button to select.

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From the Android system recovery screen (image of an Android with an exclamation mark), do the following to display the menu options:
Ensure the steps below are performed in a timely manner. If power is held too long (longer than 5 seconds), the device resets.
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Press and hold the Power button.
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While continuing to hold the power button, press the Volume Up button then release all buttons.
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Select Wipe data/factory reset.

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Select Userdata + personalized content.
Allow several seconds for the factory data reset to complete.

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Select Reboot system now.
Allow several minutes for the reboot process to complete.
If applicable, set up your device.

Related Topic:
Factory Data Reset