grace, try to remove the battery for a while, then reinsert it. If that does not help you may have to perform a hard reset. '''Performing a hard reset removes all data including the Google account, system data, app data, app settings, and downloaded apps. Only perform a hard reset if absolutely necessary. Pictures, videos and music are also removed.'''
* Ensure the device is powered down.
* Press and hold the volume down button then press the power button.
* Note When the 'Permanently Erase' screen appears, release the buttons.
* Press the Power button to perform the reset.
* Press the power button again to confirm.
* Note This boot process takes several moments, reference the progress bar located in the upper-right. If the device hangs or freezes, remove/replace the battery." from [http://support.verizonwireless.com/support/devices/knowledge_base.html/41381|here.] Hope this helps, good luck