Most Mac users smoothly passed to a new macOS Sierra operating system, but there are those who encountered problems. If your PC is slow or has failures at the software level, it makes sense to reinstall the operating system. This article will talk about how to reinstall the mac os de la Sierra, which does not involve the full Mac format and deleting user data. That is, it is not "pure" installation of a system in which all are removed data.
Although it is simply reinstall macOS Sierra, which will affect neither the most, in theory, the process can cause problems. Therefore, we strongly recommend that you back up your Mac recommend.
Reinstalling the Sierra macOS
Step 1: First, back up data on your computer.
Step 2: Restart your Mac, simultaneously press and hold COMMAND + R immediately after you hear the sound of the discharge. This is in recovery mode.
Step 3: In the window "Utilities Mac OS, select" reinstall macOS ".
Step 4: Click "Continue" and follow the instructions on the screen.
Step 5: On the disk selection window, select the hard drive you want to install MacOS, and click "Install".
After starting the process of reinstalling the Mac OS in the Sierra, the display will remain in black and white Apple logo appears with the band's progress and the amount of time remaining until the end.
At the end of the Sierra macOS automatically starts in normal mode. Your account data, applications and settings will remain in place. Reinstalling expected to re-index the files of the unit that may affect performance, but at the end of the Mac will work as before.
Some people point to reinstall macOS Sierra has helped solve many of the problems that arose after the update. Therefore, it is not necessary to use extreme measures and perform a "clean" installation.