What to do when HTC Desire 820 won't turn on?

I am not able to start my htc desire820 phone...the charging icon blinks  and i tried that power and + button...bt failed.what to do???plz help




I don't know, it happened to me second time, the phone just doesn't turn on. I tried to charge it, but nothing. The battery was at 98% and it just died. I'll go to the service and demand for new phone like I did about month ago.



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