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At irregular intervals, my MacBook Pro is emitting a chime. Not the startup chime. More of a brief "alert" type sound.

A few minutes will go by, no chime. Then chime, or several in a row. Then silence for a few minutes, etc.

I clicked notification center when it occurs to see what it's trying to alert me about. There are no notifications listed within the last hour.

I went through everything in notifications control panel and turned off audible alerts.

I turned on "do not disturb."

Power is 100%. Machine is plugged in. Light on power input is green.

Wifi is turned off. Ethernet connection is ok.

Retina MacBook Pro mid 2012.

OS X Sierra 10.12 (16A323).

  • Switch to Finder, press Cmd/Opt/Ctrl/Shift/B - does it make the same noise? – Tetsujin Oct 12 '16 at 20:18
  • What does that do? (Got a link to docs?) – Agvorth Oct 12 '16 at 20:20
  • It's just a non-command, that ought to give the "you made an oops" system beep. – Tetsujin Oct 12 '16 at 20:23
  • No it isn't that one. – Agvorth Oct 12 '16 at 20:27
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I figured it out.

It was MS Outlook client.

Outlook ignores OS X notification center. Alert config is in Outlook application preferences.

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