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#Imac os reinstall disk install#
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When complete, it installs it and reboots, and places the installer in the Applications folder. (Apple doesn’t document that, and I haven’t had to test that for years.)įailing finding it, Recovery downloads the currently installed version of macOS (or OS X), which is about 5GB. In that mode, when you choose to reinstall without erasing the drive, my recollection is that Recovery looks for the current OS system installer on your startup disk in the Applications folder, and uses that.

#Imac os reinstall disk install#

That allows you to run Disk Utility, reinstall or wipe and install the system, access Terminal for command-line functions, and so on. Normally, you can start up a Mac while holding down Command-R to boot into what Apple now calls macOS Recovery.

#Imac os reinstall disk download#

The article includes instructions on obtaining the installer, which might involve you having to use someone’s else Mac to download it, if you don’t have a replacement Mac on hand yet.īut if you can’t get access to another Mac or the necessary drive, it’s still possible to use a different Recovery mode on all recent Macs, dating back to 2010. We have instructions for making a bootable installer with macOS Sierra (as well as archived versions for several previous releases). If you need anymore help in regards to this please contact us here.Recovery lets you install onto an erased partition, but only if Recovery wasn’t erased, too!īecause Recovery didn’t work, the fastest way to install fresh is to make or borrow a macOS installer on a USB flash drive or a disk drive.

If you're keeping your Mac, complete the setup assistant with your own information.

If you erased your disk before installing, or you installed on an external drive or other new disk, your Mac restarts to a setup assistant. Your Mac restarts after installation is complete.

#Imac os reinstall disk serial number#

To verify eligibility to install macOS, your Mac serial number is sent to Apple, and you might be asked for your Apple ID. If you don't see it, click Show All Disks.

Click Continue, then follow the onscreen instructions.

Choose Reinstall macOS (or Reinstall OS X) from the utilities window.

You're now ready to install macOS.įollow these steps after starting up into the recovery agent:

When done, quit Disk Utility to return to the utilities window.

Click Erase to begin erasing your disk.

Select your device or volume in the sidebar of Disk Utility.

Select Disk Utility from the utilities window of macOS Recovery, then click Continue.

If you need to erase your startup disk, follow these steps.

On a rare occasion your Mac may have a virus or a piece of Malware.Įrasing your startup disk permanently deletes all of the data stored on it.

You need to give the Mac to another colleague and it needs to be clean from old data.

You need to give the Mac back to HardSoft.

The macOS installer says that it can't install on your computer or volume.

You're trying to resolve an issue that Disk Utility cannot repair.

You should erase your startup disk in the following circumstances. When you see the macOS Utilities window, continue to the next section to determine whether to erase your machines hard drive or begin installing macOS.ĭecide whether to erase (format) your startup disk before installing macOS.

This combination requires macOS Sierra or later. Install the macOS that came with your Mac, or the version closest to it that is still available.

#Imac os reinstall disk upgrade#

Upgrade to the latest macOS that is compatible with your Mac. Install the latest macOS that was installed on your Mac, without upgrading to a later version. Release when you see the Apple logo or a spinning globe. Hold down one of the following combinations immediately after pressing the power button to turn on your Mac.

The Recovery installs different versions of macOS depending on the key combination you press while starting up.