Well after being nearly driven mad by this infuriating squeaking noise for a couple of weeks, I finally fixed it. 🙂
Did I fix it by reinstalling the OS? No…
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Did I fix it by upgrading the OS? No…
Did I find out it was some obscure software problem? No…
Did I send it back to Apple? Did I hell – no way I’m losing my primary workstation for 2 weeks just so they can replace a CPU fan.
Here’s how to fix it in 1 easy step (warning/disclaimer – this is not recommended, it may break your mac, invalidate your warranty or cause the sky to cave in, etc etc):
Rap the back of the Mac with your knuckles, about 3 or 4 inches above the USB ports.
That’s it! No cunning solution or workaround, just good old-fashioned physical violence. I got so annoyed by the squeak that I just gave it a whack one day as a last-ditch attempt, and the squeak stopped instantly. Came back a couple of hours later (but much quieter) – hit it again, stopped instantly. Came back once more a day later (very quiet) – hit it again, stopped instantly. It’s gone from squeaking every hour or so to not a single tiny squeak for two whole weeks (and counting).
Bliss 🙂
I guess that whack must have reseated the fan onto its spindle or something.
Now I like my Mac again…