Ok, so my friend has an imac that is 18-24 months old and the hard drive started failing(smart failure). I did my best to recover files but it was much a lost cause, even tried DD and it got a portion before it just started bombing when you look at it. So the original 1tb seagate went bad, and it looks like it caused some screen bleeding on the upper left..not sure it was heat related but the imac was getting very warm, i'm nearly sure you could cook an egg on it...i honestly think that's possible. So, I picked up a WD black being naive and loaded it up...fan issue that we have all come to love. I followed a handful of suggestions online and found one of the temp leads to the optical drive and gave it a shot. A few weeks later now, he says the fans won't kick on, it will start to kick on and then they stop. He claims that it's hot, but I can't say if he's just being protective of his baby. After lots of reading, i'm quite convinced that I won't recommend anybody buy an imac if they keep up practice like this. There is no good reason to corner the market on hard drives let alone any component. And then there isn't any information from anybody that has figured it out, they're all capitalists! So be it, can't blame them too much I suppose. Anyways, I really see no way out except for using software to control the fans and write it off but that is my least favorite approach. I've read plenty, searched plenty...i don't get any solid answers but you know how that goes...if you had the solution in front of you then you would know what to search for..and you wouldn't be searching. Maybe this is already stickied somewhere, but if somebody can post me a link and tell me to RTFM then I would gladly do so, just find me the manual. Or show me where I can take searching lessons! Thanks to all that help!