I have a 15 inch, early 2011 MacBook Pro running 10.6.8. Friday night I was using Chrome, when all of a sudden little squares of light flashed randomly across the whole screen and everything but the mouse froze. I thought that was weird, so after a few minutes I forced my computer to shutdown. I waited a little and then turned it back on, and opened Chrome again. The same thing happened again, so I forced shut down, backed up Time Machine and ran a virus scan. Nothing came up, so I put it to sleep and and went to bed. Then Saturday morning I went to open my laptop and it was off, which was weird, so I went to turn it on. After the apple logo and spinning gear went away, it booted to a light blue screen and stayed there. Again I waited and nothing happened, so I held the power button down until it turned off. I tried again but the same thing happened, so I booted in Safe Mode. This time there were inch long vertical bars of horizontal lines, kind of confusing but here are two pictures I took of the screen that hopefully help. http://imgur.com/oj2WbZL and http://imgur.com/O1hwJ1B. When it finally loaded I had another issue, I had 6 pink vertical bars across the screen and a box of pink horizontal stripes around my pointer, http://imgur.com/BJBzu74. I performed an extended Apple Hardware Test and after 17 minutes it found no issues, and as it performed the test the lines got whiter and made the screen harder to see http://imgur.com/XahBD3s I got my laptop June 2011, so it's not that old. I just want to know what this problem could be. I don't know if it's the connection from the screen to the computer, the hard drive, the logic board or something else. I'm really worried that it's something major, so any help is greatly appreciated. Thank you in advance!