just checking- did you try taking the battery out, waiting 10 seconds, putting battery in and starting the phone?
you can also try hard reset-
1. Press Volume up button and hold then press Volume Down button and hold and then press the power button (briefly) to switch the phone on.
2. Keep holding the volume up and volume down buttons until you see a reset screen option.
3. Now follow the instructions that will show up on your mobile screen to factory reset your phone.
if it works dont forget to hit the thanks button!