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Message: <blockquote data-quote="chscag" data-source="post: 1630603" data-attributes="member: 46727"><p>That's a temperature sensor error.  Any program which can read fan speeds and temps should indicate 3 separate readings for your iMac:  CPU, Optical Drive, and Hard Drive. I'm not sure about your particular model iMac but it should have a temperature sensor attached to the hard drive.  Additionally there are sensors for the CPU and Optical Drive.  It's possible one of those sensors is bad.  Since you replaced the logic board, I would suspect the sensor that attaches to the hard drive. However, it could very well be another sensor that's amiss.</p></blockquote><p></p>