Hi @idefix7,
Sorry to hear that.
It sounds like your charger may be at fault here. Is there any change if you connect a different charger to your phone? If possible, use a Sony original charger and USB-cable specifically intended for your device. Other chargers may be too weak or too strong as they may have a different electric current rating (mA).
First of all, try pressing and holding the power and volume up buttons at the same time for about 10 seconds or until the phone vibrates or press and hold the OFF-button next to your SIM-card until the phone vibrates. Use a paperclip, pen or something else Then connect a charger again.
It might take about 30 minutes for the device to indicate that it is charging if it is completely discharged, during this period the display may remain black. Try charging your device for about 4 hours as it can take a while for a completely depleted battery to fully charge.
Is there any change if you connect the charger while your device is rebooted to safe mode?
Should the above not help I would, as @uliwooly suggested, recommend you perform a software repair using Xperia Companion.
Keep me updated on how it goes!
