Asus Laptop Black Screen

[piacentero]

Hi everyone. My Asus A54HR-SX233V is turning on but the screen is black. If I connect an external monitor then the external monitor sometimes displays "Frequency too high" or a black screen with blue stripes and strange characters, as you can see in the image below:

What could be the problem? Obviously I have already tried other RAMs

Thanks

 

[ficler1977]

Graphic card probably died.
If the screen would be readable onto plugged additional screen than I would blame just the laptops screen.

 

[lakimens]

It reads "Reboot and select proper boot device" or "Insert a boot disk and press any key".

 

[rgd1101]

let see display issue, can't find boot disk. Could be the system board, did something happened to it? like dropping on the floor?