I searched the forums for a solution but nothing worked. A customer's almost new Mac Mini running macOS Sierra 10.12.3 had the same problem. This fixed it, though: I deleted the cache files from Library/Caches and from Users/yourusernamehere/Library/Caches ( NOT the actual Cache folders, just the contents!) Then I restarted while holding command-r to force the computer into recovery mode, then ran Disk Utility FirstAid on the internal drive (both the indented and parent icons representing the drive). Then quit DiskUtility and quit again to restart. After the computer restarted normally, I emptied the trash (you can't empty the cache unless you restart or do some more technical stuff, but restarting is the easiest way).
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The screensaver and the hot corner work again! In my case (MBA), tried reboot, tried the SMC reset and the Pram (nvram) reset Does not work neither. One thing I forgot to mention, I have hooked up with 2 monitors - 1 with mini display port and 1 with AirPlay. If I don't have AirPlay running, the screen saver and sleep function seems to be working with the physically attached monitor, but once I extended my screen with AirPlay, neither screen saver or sleep will be working (it worked fine with OS before Sierra) In the meantime, I just have to disable AirPlay when I go for lunch. Hope it will be fixed soon. I searched the forums for a solution but nothing worked. A customer's almost new Mac Mini running macOS Sierra 10.12.3 had the same problem.
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This fixed it, though: I deleted the cache files from Library/Caches and from Users/yourusernamehere/Library/Caches ( NOT the actual Cache folders, just the contents!) Then I restarted while holding command-r to force the computer into recovery mode, then ran Disk Utility FirstAid on the internal drive (both the indented and parent icons representing the drive). Then quit DiskUtility and quit again to restart. After the computer restarted normally, I emptied the trash (you can't empty the cache unless you restart or do some more technical stuff, but restarting is the easiest way). The screensaver and the hot corner work again! Apple Footer. This site contains user submitted content, comments and opinions and is for informational purposes only. Apple may provide or recommend responses as a possible solution based on the information provided; every potential issue may involve several factors not detailed in the conversations captured in an electronic forum and Apple can therefore provide no guarantee as to the efficacy of any proposed solutions on the community forums.
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