Sometimes when a smartphone malfunctions, it is possible to fix it from the mobile settings. However, the truth is that when the mobile does not even turn on, it is impossible to solve the problem. Or not? If from one day to the next, your mobile does not turn on, this is how you could solve it.
Fully charge the battery
It is likely that you have already tried to see if the problem is that the mobile has no battery. And that you have tried to recharge the smartphone battery. However, for any process that you are going to follow from now on, it will be necessary that your mobile has a battery, and the best way to confirm that it has a battery is by trying to charge the battery to the maximum.
Press and hold the power button
There is the possibility that your mobile has run out of battery. And that the battery has been drained to the maximum. The battery would have been drained so much that the mobile would not even be able to execute the ignition process. The battery may not even be able to charge. If so, keep in mind that a possible solution is to press and hold the power button on your smartphone. And not a little, but 30 seconds, or even a full minute. You can try both keeping the button pressed without having the computer connected to the mains, and trying to turn it on while the battery is charging.
Power + volume
Another option is to use the power button and one of the volume buttons, such as the volume up button, the volume down button, or even both at the same time. It is possible that by pressing the power button and any of the volume buttons, the mobile starts the Bootloader mode, or in Recovery mode. However, here you will have different options with which you can select the normal startup mode. The point is that you will have made the mobile turn on.
Change the charging cable or charger
It is possible that the mobile battery has discharged and cannot be charged because the charger or the cable is defective. If so, then the ideal is to change the charging cable, or the charger itself. Maybe then you will see that the mobile battery does charge.