Hi all, Would really appreciate your help and advice on this issue I have encountered: I have a late 2011 15in. MacBook Pro (2.2 GHz Intel Core i7/ 500GB SATA HD/ 4GB Memory). 3 Months ago, parts of my screen started turning an alien green color. When this first came up, I ran a virus scan and Malware scan- both came up clean. This issue would happen fairly frequently, but no other issues were observed. Drive SMART status was still fine. Green color would not show up in screen grabs. Earlier this week, I powered on the MBP and got stuck on a gray screen. After numerous attempts of powering down and restarting, I could get no further. I read that restarting with the shift key pressed would start into safe mode, so I tried that. After the initial grey screen with the Apple logo showed up, the whole screen turned black with vertical blue lines. I called Apple and they had me try to restart with numerous key combinations pressed. Nothing was working. At one point, the MPB shut itself down after stalling at the gray screen yet again. When I turned it back on, the machine started up like normal, is if nothing had been wrong. I had been running Lion. Apple had me upgrade to Sierra to eliminate any software issues. Unfortunately, the issue has persisted with Sierra. I am still running into the issue with parts of my screen turning green. Now, at random times, the entire screen will turn the bright green color and needs to be restarted. Restarting is very unstable. Currently, I am unable to get past the gray screen again. Additionally, the green color now shows up on the login screen, where before it only came up once I was logged in. Apple phone support said perhaps it is the motherboard or graphics card. They also said the Mac Stores no longer support this model and my only other help would be an Authorized Apple store. This is a bit of a trek- is it worth taking this in and trying to have it repaired, or is it time for a new machine? My previous machine (Powerbook G4) lasted me 8 years. I purchased this one in January 2012, and would really like to get more than 5.5 years out of it. However, I don't want to sink money into a lost cause. Thanks in advance for any and all ideas and advice.