I have a Macbook Pro 15" (2012) with an i7 and 16 GB RAM (non-Retina). Recently I have noticed that when I wake my mac from sleep the display often has pink vertical lines through the display when displaying white sections (like text boxes). When I close the screen and reopen they are sometimes gone, though a reboot always seems to fix the issue. I have also noticed a distortion of images as well as horizontal lines across the display, again, after waking my mac from sleep mode. Rebooting the laptop always seems to fix the issue. My MBP is out of warranty and I am afraid this is a problem with the main board or graphics card. I am more than disappointed that an expensive machine like this (paid $2500) is having these issues 6 months out of the one year warranty. Any thoughts on what the problem might be?