Try these steps:
1. Remove your battery.
2. Press the power button for 15 secs. Press it a few more times after that.
3. Replug the battery.
4. Test the result.
Try these steps:
1. Remove your battery.
2. Press the power button for 15 secs. Press it a few more times after that.
3. Replug the battery.
4. Test the result.