To begin with I would recommend you to check the screen in BIOS. Turn on the system; Press at the initial Dell logo screen to enter System Setup. In case you see blurry screen in BIOS then there can be problem with the LCD screen.
I need help and getting very frustrated with the Dell support website. I have a Latitude 13 with dual core processor, only 18 months old and have installed Win7 64 bit. Most is working OK but I cannot change the brightness of the screen and so it going through the battery at the rate of knots.