Motorola Moto G (2014) — Indian Moto G2 Dead [i think]

This is all I did-

I rooted my moto g2 which was running marshmallow but something went wrong so somehow I managed to install kitkat on it [ maybe that was custom] . So after using it for a month, I faced many problems like Internet Issue, Google Play Store issues. So I un-rooted it again, and tried to install Marshmallow on it via OTA [ i got notification that Marshmallow is available ] . So I installed it, process completed 100% then phone screen gone black. And then it never again started. I've tried all solutions available on internet like volume down+power button, volume down+power button while charging. I charged it for around 2 hours but still no change. When I connect it to my PC, I get a message unknown usb, which means PC is detecting it and there's still some hope [ i think] . Also LED notification light is also not blinking.

I hope anyone of you can help me out. It's out of warranty and I don't want to spend my time and money on Service Center.

Thanks