Hello, I just installed a Western Digital Caviar Black into a '08 imac 2.4 core duo. The fans are running at super high speed constantly. I tried downloading HDD Fan Control, but it still runs at high speed. I tried resetting the PMU, other such things, no luck. The drive replaced was also a western digital. When replacing the drive I taped to the new hard drive what seemed to be the temp sensor. should i not have done that? What should i do? I thought the '08 imacs had external sensors and this wasn't a problem? any suggestions? thanks, r.