Follow these steps below to troubleshoot or potentially fix this issue:
1. Boot up in safe mode:
- Press and hold the Power button.
- Once the Samsung Galaxy S4 logo appears on the screen (assuming the phone responds to Power key press), release the Power button.
- As soon as you release the Power button, press and hold the Volume Down key.
Continue holding the Volume Down key until the phone has completed the reboot process.
- If you can read ‘Safe Mode‘ at the bottom left corner of the screen, release the Volume Down key. Otherwise, repeat the process until you can boot the phone to Safe Mode.
2. Recovery mode:
- Press and hold the Volume Up, Home and Power buttons.
- Release the Power button when the phone vibrates but continue holding on to the Volume Up and Home buttons.
- When the Android System Recovery screen appears, release both the Home and Volume Up buttons.
- Using the Volume Down key, highlight ‘wipe cache partition.’
- Press the Power button to select the option.
- The phone will automatically restart once cache data are wiped out.
These are just two steps. If these do not work please let me know and i will further help you in your struggle.
Ryan (TechLegion)