why a spoke wheel sign keeps on coming to screen on macbook air?how to prevent it?pic shown below
MacBook Air, OS X Yosemite (10.10.5)
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That's the brightness indicator. It will appear when the brightness level is being changed. This can be from using the brightness up or down (F1 or F2) keys, from within System Preferences, or a third party app that's running may be controlling it.