I agree with @jimfixer
Before doing so, however, try a last ditch effort by wiping the cache partition.
• hold down the Volume Up + Power key.
•As soon as you see Android Robot, release all buttons.
•Press Power key to enter to Recovery Mode.
• From the menu choose "Wipe Cache Partition" by using Volume buttons to scroll and Power button to select options.
• Select "YES" on the next screen if it asks
Once this is done select the option "Reboot System Now"