my Samsang grand neo unable to switch on

[AC Question]

Last night phone was charged and early morning unable to switch on my phone

 

[Ian Morgan2]

Have a look thro' the following article :-
What to Do When Your Android Phone or Tablet Won’t Turn On
Extract :-
Pull the Battery or Long-Press the Power Button
Like other operating systems, Android can sometimes hard-freeze and refuse to respond. If Android is completely frozen, your device may be powered on and running — but the screen won’t turn on because the operating system is frozen and not responding to button presses.