1. Turn off your smartphone
2. Turn it on again
If that doesn't help - repair service and diagnostics. If you're far from a service, you're thrifty or there are any other reasons:
1. Back up your data
2. Restore factory settings on your smartphone
If it still doesn't work - repair service. Alternatively: use a smartphone with a glowing LED or consider buying a new one.
2. Turn it on again
If that doesn't help - repair service and diagnostics. If you're far from a service, you're thrifty or there are any other reasons:
1. Back up your data
2. Restore factory settings on your smartphone
If it still doesn't work - repair service. Alternatively: use a smartphone with a glowing LED or consider buying a new one.