Hello and welcome to justanswer, My name is ***** ***** i will be assisting you today,
I'm sorry about the issue, what is the moel/brand of your laptop please?
when did this start, also when you first turn on the laptop, does it look normal and can you see the asus Logo Screen?
Ok let's try a simple reset of the laptop. Please do the following:
let me know the results please
Do you have a recovery disc or windows 8 disc ? can you try to boot from the cd ?
yes i know, do you have a cd/dvd reader ?
Are you able to boot the PC into Safe Mode? If you are able to access Safe Mode remove the graphics driver.
If the problem persists, I'm very sure you have a hardware issue. you need to replace the video card device or replace the monitor
unfortunately it is a hardware issue and we can't do anything about it, you can request a refund by going to this page : http://ww2.justanswer.com/help/how-can-i-request-refund