Hi, I'm writing because of a Logic board failure on a 2011 macbook pro. Yesterday the macbook started to glitch and freeze, and I already replaced my logic board four times in the past because of this failure. I called apple care, they agreed that a logic board failing 5 times in 2 years is a bit too much and they told me they were going to give me a new macbook . Back home I tried to run the macbook in safe mode just to access some important files I had to backup: the problem completely disappeared. Apple Hardware test says everything is ok. I know it's going to happen again (in the past it took 3 weeks to completely freeze the computer), but I should send my macbook next week for having it checked. So my weird question is: how can I "test" the logic board to prove it is faulty? How can I make the glitches reappear again? It's just a question of time. Thanks!