![]() Once in Safe Mode, click on the Apple menu (top left of the screen) and click About This Mac, then Software Update. If the culprit is an out-of-date OS, it can updated from within Safe Mode:ġ. Fortunately they, too, can be managed from within Safe Mode, according to the method below: Login items are another frequent culprit of a Mac that won't boot. This points to other problems, possibly with the operating system itself requiring an update. Sometimes the above tips may not fix a stubborn MacBook or iMac that refuses to turn on. See /uk/batteries for more information.(Image credit: Shutterstock Edit) How to fix a Mac that won't start: Software needs updating Battery life varies by use and configuration. The Apple TV app movie playback test measures battery life by playing back HD 1080p content with display brightness set to 8 clicks from bottom. The wireless web test measures battery life by wirelessly browsing 25 popular websites with display brightness set to 8 clicks from bottom.
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