toyouopf.blogg.se - Reinstall macos sierra

This will begin the process of reinstalling MacOS High Sierra on your drive. Once the drive has been erased, close the Disk Utility window and click on the Reinstall MacOS option in the MacOS Utilities window. This will erase the drive and format it for MacOS. This will bring up the Disk Utility application.Ĭlick on the drive that you want to erase in the left sidebar of the Disk Utility window, and then click on the Erase button. This will boot your Mac from that drive, and you will see the MacOS Utilities window appear.Ĭlick on the Disk Utility option in the MacOS Utilities window, and then click on the Continue button. Select the drive that you want to erase and reinstall MacOS High Sierra on, and then press the Return key. This will bring up the Startup Manager, which will allow you to choose which drive you want to boot from.

Once you have backed up your data, restart your Mac and hold down the Option key while it boots. This will erase all of the data on your drive, so be sure to back up any files you want to keep before proceeding.

So next time your Mac is acting wonky, reset the PRAM and it should be back in working order.If you want to erase and reinstall MacOS High Sierra, you will need to reformat your drive. Resetting your PRAM will not only fix this particular OS X install issue, but it can also fix network issues, sound issues, and display issues. No user data will be lost in this process.

After the second chime, let go of the buttons and let your Mac restart as normal.

Continue to keep these buttons held until you hear the Mac startup chime twice.

Then, hold down Command, Option, P, and R buttons on your keyboard as you restart your Mac.

First, completely shut down your Mac via the Apple Toolbar.

However, sometimes this memory can get skewed, causing problems and requiring a factory reset. This memory is used to store info on your startup disk, startup volume, speaker volume, and timezone information amongst other vital system information. So, what is PRAM anyway? In the Mac world, PRAM stands for Parameter Random Access Memory. So after a bit of brainstorming, I ended up fixing the issue by resetting the PRAM on all of the iMacs. Last night, when attempting to restore three iMacs to a fresh Install of OS X, I was left with an annoying and slightly frightening message: “OS X Cannot Be Installed On This Computer.” For some strange reason, this happened to me on three different iMacs, all of which previously had Bootcamp partitions.