iMac late 2008, 2GB RAM, Mavericks 10.9.2, Noise in sleep

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iMac late 2008, 2GB RAM, Mavericks 10.9.2, Noise in sleep

What keeps making the cyclical noise while in sleep? Sounds like iMac is loading an application, a graphic, or a different screen. Does it periodically while in sleep mode. Does seem to do with increasing frequency as time passes while in sleep. How do I correct this? Just started doing it in the last few months. I'm afraid I'm setting myself up for some kind of premature hardware failure. I've tried everything such as checking Energy Saver settings, Bluetooth settings, print queue, etc.

iMac, OS X Mavericks (10.9.2)

Posted on Apr 24, 2014 6:29 AM

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josephhi Author

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Apr 26, 2014 1:50 PM in response to josephhi

I finally figured out how to fix this. First I reviewed "Mac OS X: Why your Mac might not sleep of stay in sleep mode." I noted the bullet: "Do you have any other external USB or Firewire devices connected?" I have an CP685AVR for a UPS for my Mac. I replaced the battery a few months ago. I also hooked up Apple's 'Energy Saver' power management software to the CP685AVR using the USB connection. I disconnected it, and that solved the problem. I still have the UPS and battery back-up; I just can't "monitor" the battery. What's to monitor? It always said the battery was 100% charged even right up to the time the previous battery failed. Thanks for listening, uh... reading.

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