Why can't I wake up my phone since upgrade to Marshmallow

Please help me, guys. This morning I upgraded my Android from Jellybean to Marshmallow (6.0.1) and when I turn off my screen with the power button and it cannot be turned on anymore. While being off, when I press the power button nothing happens(at least seen) but because I have a password and when typing it the phone vibrates, when I press on the black screen where the keyboard is, the phone vibrates so I guess I can do everything but I cant see it...so the only way to turn the screen on is to restart the phone and I must not turn it off even when not using it because it cannot be turned on anymore without restarting....please help. (USING HTC DESIRE 820)

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