Power button stopped working it fall down I am using Asus ZenFone since 8 months but after fall down the power button stopped working which is actually creating a problem for me. What can I do about it?
1) If you still have warranty then try to repair it for free.

2) You can also try to repair the ZenFone for money. But i think it will be too expensiv.

3) If you doint want to spend money the install an Power-Off-App like 
This one.
And for Wakeup you can try to install/enable Double-Tap to Wake.

I hope i could help you:)

P.S If there's an other way then let me know.