Dear all, I am a macbook user for 5 years already. I bought MBP 15" top model in June 2010, and it has been working fine. I had hard drive noise (Hitachi 500G 5400) since few months ago, and got it replaced in the Apple Shop. Then my nightmare starts. the 2nd HD failed within 4 days, the 3rd hard drive failed within 8 days. They were complete failing, no start-up, no detecting the HD. I had the 3rd HD replace by an authorized repair center, not the Apple Store. I asked them to check the logic board as well, but they didn't (ah, lazy). I have no access to Apple Store at the moment. So I am on my own, diagnosing what's actually wrong with my MBP. What do you think?