Hi guys, long time reader and user but first time commenter. I've been having issues with the laptop and have had so many severe symptoms which point towards the faulty logic boards on these models. These issues started a hear ago and have previously replaced the logic board for similar issues. For over a year my Mac has been freezing, random restarts, hard shutdowns, grey screens, blue screens, can't boot into safe mode, green and pink horizontal lines and many other symptoms along with those. It goes through a restart loop and I've restarted over 5000 times thinking it might go through. On a few odd occasions it has and it doesn't last very long. I took it into Apple last year and the technician hardly looked at the laptop and said its fine even though I had around half of the symptoms back then. I've seen many users with the same issues and sometimes the diagnosis report says everything is fine when clearly it's not. My main concern is my data hasn't been backed up because of these issues and the Mac not recognising my external hard drives as well because of this. My questions is, if I get the logic board replaced then it shouldn't affect my data should it, since all OS and data settings are on the hard drive? What's the chances of the new logic board not working with the hard drive or corrupting the hard drive once it gets connected onto the new logic board? My other concern was the employees maybe copying my files through target disk mode without my permission. What are he chances of these things happening? Cheers for your responses!