I was finally able to get my MacBook to stop “mooing” using a hack from the website Moofix. It’s not elegant, but it beats listening to a constant moo.

For those who are unclear on the subject, the moo is the sound the MacBook makes while it’s fans rev briefly in an attempt to cool the machine. This succeeds temporarily so the fan shuts off, only to restart seconds later when the machine heats up again. Apple needs to come up with a firmware fix for the problem, but the Moofix is a simple and effective solution for the time being.