My htc desire 820 dual sim not turning on, orange led blinks when i put it on charge

[Saksham0161]

I was playing pokemon go then i turned off pokemon go and started using facebook app, my battery was 50 percent, all of suddent i saw a black screen in which on the top left corner i suspect there was a cursor (i am not sure though since it was partial white light on the verry corner) after that my phone turned off. i tried turning it on, it didnt, i tried soft reset by pressing and holding both vol down + power nothing happened, i tried attaching it with a charger orange led keeps on blinking, i tried to put it on charge for 3 hours then tried a soft reset it didntwork either. then i attached it with laptop, laptop didnt recognize it.
Please Help

 

[B. Diddy]

Did you install Pokemon Go from Google Play or some other legitimate site? If you sideloaded it as an apk, there's always a risk of malware.

Try keeping it plugged into a wall outlet overnight, undisturbed. Then press and hold Power for 10-15 seconds to power it on.