How to restart Lenovo ZUK Z1 when it hangs?

My new lenovo zuk z1 hangs and i am unable to switch off the mobile.  How to restart the mobile and what to do that hanging problem is solve.

My pone hanged  and the touch is not working pone is not responding

power button is not working,screen is locked...

But power button is also not working

It got damaged

Hi there. Press and hold power button 'til the phone turns off. You should be able to normally turn it on after.

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