For awhile now I've had this neon green line on the left side of the screen. On rare occasions, it'll flash blue real quick and then go back to green. Sometimes when I open the MBP just right, the line won't appear. But as soon as the screen in tapped, it'll come back. Is there anything I can do besides replacing the monitor? If I take it to a Genius bar, roughly how much will a repair cost without Apple care? Thanks for any help!