Z3 randomly stopped working!

When I went to sleep last night, my phone was working fine. It was on my bed and charging. When I woke up this morning, it was still plugged in but completely dead.It won't turn on, it doesn't have the red light when charging, nothing. I tried a different charger, tried the force restart, even tried the little yellow button and still nothing.The only thing I can imagine is that it severely overheated and blew the engine. Nothing else makes sense. Is there anything else I can do beyond replacing it? 

You may need to perform a software repair using PC Companion.The process will erase all internal memory.You might need to charge your device for about 1-2 hours before so the device has at least 80% battery.
Make sure the device is not connected to computer or laptop and turned off (sometimes you have to press power button and volume up until the device vibrates 3 times or on some devices you have to press the small button near the SIM tray or on the back of the device).
Open PC companion->support zone->phone/tablet software update->repair my phone/tablet blue highlighted.Follow the steps given,do not connect your phone until prompted to press volume down while plugging USB cable. If PC companion does not start the repair process, you might need to run it in compatibility mode with Windows 7 (in some cases XP).

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