According to MG :
I have a ceiling fan goes Groan Groan Groan. As soon as turn the power off
the noise quits which is telling me that the problem has a strong electrical
components rather than simply a mechanical problem.

Any idea on what to look for when I take it down and open it up.

Does it have a lamp fixture mounted below it? If so, look for
vibration between the socket and the mounting shell.

The one in our bedroom does that -- but not as loud as it used
to do, so I can live with it the few nights when it is hot enough (even
with the air conditioning) to need it.

Enjoy,
DoN.

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