Hi friend,
In this case I would recommend you to connect any external monitor to the laptop and check if you have the same issue on the external monitor as well.
If the same issue occurs on the external one than we can try installing the latest video drivers for the same'
If the external is fine, then i would recommend you to please change the LCD of the laptop
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Just to add j_druce, here is the Service Manual from Dell Support, (Click on > Before you begin, then click on > Display Assembly)http://support.dell.com/support/edocs/sy...
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