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One possible fix for a Mac that won't sleep its display System
A little while back i started noticing that my MacBook Pro's display wasn't going to sleep. My Energy Saver settings were configured to put the display to sleep after 15 minutes, but it wasn't happening, even after hours of idle time.

After quite a bit of hunting and head scratching, I finally figured out what was going on. I'd been working on the website for my iPhone game (HexaLex), and I'd opened the Convertbot website in a Safari tab as a source of inspiration.

The Convertbot site has an embedded QuickTime movie demonstrating their user interface. It turns out that this QuickTime movie was preventing the display from sleeping, even though it wasn't in the frontmost tab. Closing that tab solved the problem.

So if your Mac's display isn't sleeping, be sure to check your browser tabs for embedded movies!
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One possible fix for a Mac that won't sleep its display | 4 comments | Create New Account
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One possible fix for a Mac that won't sleep its display
Authored by: processfive on Dec 18, '09 08:13:23AM

Likewise, pages that automatically refresh (either through a simple page refresh or via an AJAX or other scripted refresh) can prevent your Mac from sleeping. When I have Gmail open in a tab in Firefox (even if it isn't the selected tab), my Mac simply will not put itself to sleep. Closing non-static pages or closing Firefox altogether solves the problem. I suspect that it has something to do with the browser caching the new page content on disk, thus resetting the sleep timer.



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One possible fix for a Mac that won't sleep its display
Authored by: drewk on Dec 18, '09 03:49:41PM

Another one that will keep a Mac from sleeping that took me some time to figure out: Screen sharing, VNC, and Remote Desktop server sessions. ie, another computer viewing the non sleeping mac's display.



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One possible fix for a Mac that won't sleep its display
Authored by: luomat on Dec 20, '09 10:12:58PM

My iMac *sometimes* will keep trying to show the login screen (while the screen is "off"/locked).

Thanks for the hints. It's been driving me nuts because I can't figure out why sometimes it does and sometimes it doesn't.



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One possible fix for a Mac that won't sleep its display
Authored by: wealthychef on Feb 03, '12 06:22:29PM

I was unable to get my Mac Pro to sleep at all until I turned off Remote Management under Sharing in the System Preferences. I can see why Apple does that, but they should give you the choice to sleep AND allow remote management when awake.



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