Vertical lines o my desktop. I have hp pavilion zd8000.Laptop is just 1 year old & still in

Question

I have hp pavilion zd8000.Laptop is just 1 year old & still in excellent condition.I got the vertical lines problem.My screen is full of colour lining from top to bottom as I start the laptop & it remains permanent..Though the laptop works fine.I can see my desktop and i can work on it but the coloured lines remains permanently.so what can i do to remove the lines from my desktop.