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What does this error code mean...4SNS/1/C0000008 TL0P==124

Replaced HDD with same manufacturer but larger capacity. Sensor cable fit perfect as original, but fans running fast. Did hardware test and came up with this error code...4SNS/1/C0000008 TL0P==124

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  • 48 Answers

It's a temperature sensor error, usually the fans run at maximum rpm when this happens. The error indicates the LCD temp sensor is either reporting out of range data, is disconnected, or has failed. It is probably a damaged or disconnected sensor cable. A disconnected or missing sensor would simply force the fan(s) to run fast to protect the system.

Posted on Dec 07, 2013

  • Hugh Browton
    Hugh Browton Mar 31, 2015

    I've this error code after replacing both the temperature sensor AND the optical drive fan

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SOURCE: Error code when running Apple Hardware Test

Its an issue with the hard drive in the lower slot. The volume may be corrupt of the drive could be physically damaged. Did you install the bottom drive? is it the drive with the OS installed?

What does SMART statues report in DISK UTILITY?


Hard Drive/Application/Utilities/Disk Utility3a047e2.png

Let me know.

Posted on Oct 28, 2007

  • 22 Answers

SOURCE: DVD write problem and hardware test error code

I hope this works for you it did for me when I updated all my firmware.

http://docs.info.apple.com/article.html?artnum=88275

Posted on Apr 16, 2008

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DVD write problem and hardware test error code


I hope this works for you it did for me when I updated all my firmware.

http://docs.info.apple.com/article.html?artnum=88275

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