First Gen LG Stylo ,,,,Question?

I have a 1ST Gen LG Stylo and when I turn it on it starts to boot up and then the metro PCS ball roll across the screen then just stays and freezes up at that stage. I have taken the battery out of the phone and left it out for a good while and when I put it back in the phone it still just goes to that same boot up screen, the screen with the metro ball rolling by and freezes up in that same place every time. Also the battery is fully charged 100%,,,

Any ideas why this is happening or how to fix this bootup problems ????