HTC One M8 not turning on or charging

A

AC Question

Installed Viper Rom 5.0.2 running normally for around a month.
I plugged the phone as usual for charging in night at around 15% battery level.
In morning phone was dead.
Left it charging for a while but unable to switch it back on.
No led comes up while charging.
Did lot of research online and Tried all methods like pressing Power + Up or Power + Down or Power + Up + Down for a while for switching the phone on.
But no response from the phone

Connected with PC shows up as QHSUSB_BULK under device manager.

Please help in reviving my phone.
Thanks
 

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