My Late 2008 MacBook Pro had been running strong for three and a half years. Then in June, I bought a new Magsafe power adapter block because I thought my old block broke (it didn't). It was used from Amazon, kind of beat up, but it worked. Anyway, I used it for 8 weeks, then my logic board failed in August. I got it fixed, then I used it for another 8 weeks and my logic board just recently failed again. Same thing, just won't turn on. I'm not sure if this is a strange coincidence, or if the power adapter block could be faulty and causing my MacBook to fail. What do you think? I'll probably go back to my old adapter after this time. The only odd thing I noticed was that sometimes when I would plug my MacBook in, the adapter would light up with a faint green light instead of a bright one and wouldn't charge. I would have to replug it back in to get my computer to charge. But my old block did this too.