Unfortunately it can take a few days for recharge and turn back on. It’s possible something could have caused the phone to have grounded out which disables and discharges the battery completely. Have you tested with a different USB cable?
Normally when you connect power it should vibrate, then you should see the LED indicator light showing its charging. Then you should see the battery symbol on the screen, please see
Very important best practice guide for first time usage on our Asus Android mobile devices (cellular phones & tablets).
If you would like further assistance, please feel free to contact me at
cl-frank@asus.com with case # N160195982 in the subject line.
Sincerely,
Frank
ASUS_USA