Dell Studio XPS 1645 PP35l Screen/Display Problem Please Help!

Hi there,

I am new to these forums and I hope that you guys will be able to assist me in a problem i have with my sisters dell laptop.

She has the above laptop model mentioned in the subject and when the laptop is turned on the screen is all skew whiff and seems to overlap the same image 3 times or so with patches all over. This happens with and without a hard drive although when booted up to windows when i move the cursor over black patches the images displays but only for a few seconds then goes back to black. I have attached the images below to show you what's going on my end. 

I have already tested the display by holding 'D' at start-up and all solid colours displayed so screen is fine.

I have plugged into an external monitor and it shows the same thing so leads me to a hardware fault somewhere.

I have also detached the touch pad to see if that was causing issues as seen on another post but that doest affect it. 

Any help would be greatly appreciated as i dont really want to purchase a new laptop due to it was alot for her to buy.

Kind Regards

Tim