HT205579: About the OS X El Capitan v10.11.2 Update
Learn about About the OS X El Capitan v10.11.2 Update
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Q: Did it make a weird noise when you installed this update? It made a weird beep noise and I had to press the power button for it to ... Did it make a weird noise when you installed this update? It made a weird beep noise and I had to press the power button for it to resume. more
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Helpful answers
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Dec 8, 2015 11:16 PM in response to tsperlzby Carolyn Samit,No weird beep noise here during or after the update here.
As long as your Mac is running as it normally does, don't worry about it.
If the beep continues, that could be an indication the RAM (memory) is failing.
You can run the Apple Hardware Test > OS X El Capitan: Use Apple Diagnostics or Apple Hardware Test