I finally brought my deuced Mac(hina) to the local "Genius" Bar and detailed my assorted symptoms, and the genius noted the possibility of sensor or logic board failure, but when I got my Mac back I found that the only thing that had been replaced was...my fan assembly.
Does the fan assembly include sensors, and, if not, does anybody see the point of changing it when its excessive running appears to have been the result of something overheating?
The fan does seem to be somewhat quieter at the moment, but the erratic nature of my symptoms makes that fact more or less meaningless.
More as more transpires.
