Why can't I get my Asus Zenfone 2 to turn back on after it shuts down?

Whenever i tried to turn it on it vibrates but no logo appearing. What should i do?

Please ensure to use genuine ASUS AC adapter/USB cable. Please check if cable is firmly connected and charge for several hours. Please also try connecting to PC to see if its recognized. Have you tried booting into Fastboot mode? 1. When device is off, press (also hold) volume up key and then press (also hold) power key. After the device vibrates, release power key (keep holding volume up key) to enter Fastboot mode, please also see ASUSTeK Computer Inc. -Support-

Sincerely,
ASUS_USA
cl-frank@asus.com

Same here..
Nothings happen any more.

Dear All,

If the unit can no longer power on after above troubleshooting methods have been performed then it will require warranty service. If located within the USA or Canada and would like RMA assistance please feel free to contact me direct at cl-frank@asus.com.

For all other regions please see the following support page: Support Center | ASUS Global

Sincerely,
ASUS_USA