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.
Perform a factory data reset only if absolutely necessary as it removes all data including:
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Google™ account
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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.)
An alternate reset method is available if the device can be powered on and is responsive.
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Ensure the device is powered off.
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Simultaneously press and hold Power + Volume down buttons until the System recovery screen appears then release.
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From the System recovery screen, select Factory data reset.
Utilize the Volume buttons to highlight and the Power button to select.

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Tap Yes to confirm.
Allow several minutes for the reboot process to complete.
If applicable, set up your device.
Related Topic:
Factory Data Reset