There are several causes for this: Dust buildup in the computer prevents proper cooling, so the fans have to work harder. Corrupted Power Manager chip settings. Go to the Apple support page and search for "Power Manager" "reset" and your specific model. You can get the model number from the System Profiler utility (Apple menu: About this Mac: More Info). If this is the problem, resetting the Power Manager should solve it. If it happens again after unplugging, you may need a new clock/PRAM battery; Bad temperature sensor (all fans run at high speed); Shorted fan driver transistor on the logic board or in power supply (one fan always runs at max speed).

4sns 1 4000000 th00 9.000

Fans run continually

Anonymous May 24, 2013

Although the Apple store wouldn't say, I believe the problem was due to the fact that when I had a new HD installed, they did not plug back in the heat sensor cable from the logic board to the HD. They got the same HD error as me, (4 SNS 1 40000000 TH00 9.00) which tells them its a sensor problem. They said they put in another new HD. I'll never know what the truth is. All I know now is it's as quiet as a morgue.

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Kasius51

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There are several causes for this:

Dust buildup in the computer prevents proper cooling, so the fans have to work harder.
Corrupted Power Manager chip settings. Go to the Apple support page and search for "Power Manager" "reset" and your specific model. You can get the model number from the System Profiler utility (Apple menu: About this Mac: More Info). If this is the problem, resetting the Power Manager should solve it. If it happens again after unplugging, you may need a new clock/PRAM battery;
Bad temperature sensor (all fans run at high speed);
Shorted fan driver transistor on the logic board or in power supply (one fan always runs at max speed).

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