Hello,
My name is Scott, I am with the Asus Customer Loyalty team.
Are the lines there from the moment you turn the computer on or do they only show up after some specific event, like Windows starts loading?
If they are there from the time you turn the computer on, then sorry to say your display panel needs to be replaced. If it only happens when some specific event occurs, then there's a decent possibility that it is linked to whatever is going on when the problem starts.