andrea bagani without seeing this line and only going by your description, this sounds like a Tab error. This is a fault where the ribbon cables from the LCD driver board to the LCD screen come loose. The only real option to fix this would be to replace the screen. There are companies out there that perform TAB repairs but those cost more than a new screen. [guide|24737]
To verify this, you can post some images of what the screen shows with your QUESTION. [guide|21499]