If the installer asks to unlock your disk, enter the password you use to log in to your Mac. You will be asked to choose a disk on which to install. Then click Continue and follow the onscreen instructions. When you're ready to reinstall macOS, choose Reinstall macOS from the Utilities window. If you need to erase before installing macOS, select Disk Utility from the Utilities window, then click Continue. You probably don't need to erase, unless you're selling, trading in, or giving away your Mac, or you have an issue that requires you to erase. Decide whether to erase (format) your disk When you see the utilities window, you have started up from macOS Recovery. Enter the requested password to continue. You might be prompted to enter a password, such as a firmware password or the password of a user who is an administrator of this Mac. Reinstall the macOS that came with your Mac, or the closest version still available. Upgrade to the latest macOS that is compatible with your Mac. Reinstall the latest macOS that was installed on your Mac (recommended). Release the keys when you see an Apple logo, spinning globe, or other startup screen. To start up from macOS Recovery, turn on your Mac and immediately press and hold one of the following sets of keys on your keyboard. If a wireless network is available, you can choose it from the Wi-Fi menu, which is also available in macOS Recovery. All you need is a connection to the Internet. MacOS Recovery makes it easy to reinstall the Mac operating system, even if you need to erase your startup disk first. Apple Mac OS X OSX Tiger 10.4.6 Install DVD Disc 1 & 2 plus Manual, stickers 4.5 out of 5 stars (9) 9 product ratings - Apple Mac OS X OSX Tiger 10.4.6 Install DVD Disc 1 & 2 plus Manual, stickers. At this point you can either create the installation disc, or you can copy the installer to a backup location so you can. 
Go to the Applications folder and locate the Install Mac OS X Lion package.
If you are upgrading or replacing a Mac hard drive and you don't have an operating system, this video will. Many Mac hard drives break down and stop working. Here is a detailed guide for the process. Two options are to use Duplicate (a free utility which can copy and paste an entire bootable volume), or Mac Backup Guru (a paid, fully featured backup utility with unique incremental backups capability) for that. What’s needed for a clean install on a Mac A backup of the disk before it’s erased.
Simplify creating a bootable macOS installer.
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