Screen no display after restart it from sudden black out.

Hello.

I'm using Asus Laptop for more then 4yrs...

I'm using it to watch video and suddenly the screen goes black out this morning! And I restart the laptop..it's start , everything lights up and it beep but no screen displayed...

And I use another monitor to connect with it and showed the pc screen with cracked lines and is blue in colour...

So, what is the problem with my asus pc laptop and How to turn it rights???????

Needs HELP....Pls...TQ!!!