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 and review this need to know info before proceeding to prevent the potential loss of important data (e.g., contacts, music, pictures, downloaded apps, etc.).
An alternate reset method is available if the device is unresponsive or won't power on.
Related Topic: Factory Data Reset