Mac 
If Media Browser doesn’t show your entire Photos library
Sometimes the Media Browser, which lets applications like Pages or iMovie use images from Photos, doesn’t show all the available pictures from your Photos library.
OS X: Application icon has a prohibitory sign, or "PowerPC applications are no longer supported" appears
When attempting to open a PowerPC-based application, this alert appears: “You can’t open the application (name of application) because PowerPC applications are no longer supported”. PowerPC-based applications display a white prohibitory sign over their icon in the Finder.
Mac notebooks: Spotlight indexing may make the fans run
Sometimes you may notice that your computer’s fans run on high after you perform a data migration from another computer and Spotlight begins to index your hard drive for the first time.
Use Keynote Remote on your iPhone, iPad, or iPod touch
Learn how to use Keynote Remote to control your Keynote presentation from a compatible iOS device.
Learn about overscan and underscan
You might see the terms “overscan” or “underscan” used in OS X, Apple TV, or your favorite app. This article explains what these terms mean, and how selecting or changing related settings affect output to a television.
If your MacBook stops responding during setup
Learn what to do if your MacBook (Retina, 12-inch, Early 2015) stops responding and shows a spinning wheel in Setup Assistant.
Use accessibility features on your Apple Watch
Learn about VoiceOver, Zoom, Font Adjustments, Mono Audio, and other accessibility features.
If Pro Video Formats 2.0.1 doesn’t appear in Mac App Store updates
Learn what to do if Pro Video Formats 2.0.1 doesn’t appear in Mac App Store Updates.
Update your supervised devices to iOS 8.3 using Apple Configurator
If you’re using Apple Configurator, use these steps to update your supervised devices to iOS 8.3.
