OS X 10.13.6: My 2011 27" iMac is suddenly producing and alarm sound every evening at 9:05 that seems unstoppable. It stops by itself after a while. How do I discover what's producing it.
No, just the sound. 3 beeps, pause, 3 beeps, for 5 seconds then repeat. Finally get insistent. Goes away about an hour later. Not responsive to volume control or mute.
That pattern, and the fact that volume/mute don't affect it, makes me think of a hardware issue. When you have failing RAM or other logic board issues, you will get a repeating pattern of three beeps.
Does it sound like the beeps in this video at the 1:25 mark:
A couple more things to check - look at the > System Preferences... > Notifications and see if there is anything possibly related there. Also, do you happen to have Microsoft Outlook installed?
I've searched through iCloud stuff and don't see anything there either. I don't think it's any kind of hardware warning because it happens a few minutes after 9 PM every night and goes on for an hour. Fortunately it's not very loud (I'm deaf at those high frequencies) and I can continue to work. Thanks for what you've done so far.
I don't have Outlook and don't have any daily notifications. In the preferences of apps that post notifications I've turned off sound.
Let me simplify: where are the places I might look to see if daily alarm is stored in OS X? I don't mind using the Terminal to look at them if necessary.
Yes, I did, but of course not knowing exactly what to search for makes that tough. Tonight when it goes off I'll be able to look at the bottom of most of them.
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