I cannot turn my phone on and I cannot factory reset

There is no other solution,if the phone fell and something from inside it is broken the only solution is a repair,if it cannot be repaired it should be replaced but it will cost more depending on the phone and the component that is broken.

REST my phoneHTC DESIR 820

canot open my mobile

try to hold on power button with the down volume button till it open the remove ur fingure of power button then wait seconds till screen light off then choose reset to begin reset your phone ((( if not hardware problem )))