Did you try some basic troubleshooting steps already?
Force restart the phone (soft reset): Press and hold the power and volume-up keys until 'Powered by Android' is displayed on the screen.
- Check if it works now, before trying the next step.
Restart the phone in Safe Mode: Press power, then press and hold the Restart option in the shutdown menu until it prompts to restart in safe mode.
- Check if it works in safe mode, then do another restart to get back to normal mode.
You may have do set up some third-party screen widgets after using Safe Mode, but it does not delete any personal data or other app settings.
Please let us know how it goes?