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:
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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.)
If a pattern, PIN, etc. is or has ever been set up on the device, Google account sign in is required during initial setup.
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Ensure the device is powered off.
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Press and hold the Volume up button (second button from the top; on the right edge).

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While continuing to hold the Volume up button, press and hold the Power/Lock button until the Ellipsis screen appears then release but continue to hold the Volume up button until the 'Android recovery' screen appears.

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From the Android system recovery screen, select Wipe data/factory reset.
Utilize the volume buttons to cycle through the available options and the Power/Lock button to select.
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When prompted with 'Erase all user data? THIS CAN NOT BE UNDONE!', select Yes.
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.
To set up the device after the reset has completed, refer to Initial Activation and Setup.
Related Topic:
Factory Data Reset