What to do when HTC Desire 820s hang?

My mobile htc desire 820 s was hang what can i do?

Pressing the power button for 10-15 minutes didn't work. It's been hung for almost a day.

Usually, press and holding power key alone works.

Alfred Joel Wylie

Turn it off by pressing the vol down and power button, and start it again.
There u go..!

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