Mac time not updating
Being stuck on an old version of mac OS is not something you can safely ignore.
For one thing, running an old operating system means you won't receive critical security updates from Apple.
Moreover, many third parties have stopped releasing software updates compatible with older operating systems.
For example, the latest versions of Chrome and Firefox won't run on anything older than Mavericks.
Before installing mac OS Sierra, uninstall or disable any antivirus software on your Mac, as that may be causing issues.
Press the power button on your machine while holding down the Shift key on your keyboard.
We've contacted Apple for clarification, but have not yet heard from them.
says, quoting sources familiar with Apple's internal investigation of the matter, that the reason for Apple removing the feature is that it's, simply put, inaccurate.
The change — although not insignificant, especially given the complaints about Mac Book battery life — is not mentioned in the official release notes for Sierra 10.12.2.
OS X El Capitan is the twelfth major release of OS X for Mac computers. Some users have reported an issue where Mac refuses to finish booting after updating to OS X EL Capitan.
If your There’s speculation that File Vault (specifically, File Vault2 encryption) causes this particular problem.
Apple recently released a new version of its Mac operating system, mac OS Sierra (version 10.12).
With the release of Sierra, Apple decided to drop support for some Mac models that were supported by several previous releases of the Mac operating system.Boot your Mac into Safe mode, then try installing mac OS Sierra again.