[ubuntu] Random pink / blue lines on screen which disappears with image

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http://ubuntuforums.org – Hi, I have a Dell Studio 1555. It was running Windows 7 and now i have changed it to Ubuntu 12.04.1. The problem I have is a bit ridiculous. For some pictures alone, a quarter portion of the screen shows pink and blue horizontal lines. I tried taking a screen print, but the lines do not appear on them. Also funny thing is, if i scroll the picture up or down, the lines shift in position as well along with the picture. Searching on Google pointed me to laptops with broken / faulty video cards. But i have a strong feeling this is not so. I am relatively new to linux. If you think there is s (Hardware)