Turn the computer off, hold down the letter "D" and while still holding down the letter "D" turn the computer back on and see if you can run the LCD diagnostics. If solid colors are displayed on the screen than the LCD is fine, the problem would be the graphics chip on the motherboard itself more than likely. Another way to access this test is to press F12 numerous times when you see the Dell Logo. That will bring up the boot menu. From the boot menu select diagnostics, when it displays the color bars and asks you if can see them, tell it no so that it runs the LCD test and see if you see the solid colors that way. I honestly don't think it is the LCD panel, I'm leaning more towards the motherboard myself.