How do I reinstall Mac OS X Lion?
Reinstalling Lion
- Restart your computer, and immediately hold down command-r until the gray Apple logo appears.
- If prompted, select your main language and then click the arrow.
- Click Reinstall OS X, and then Continue.
How do I manually reinstall Mac OS X?
Reinstall macOS
- Install the latest version of macOS compatible with your computer: Press and hold Option-Command-R.
- Reinstall your computer’s original version of macOS (including available updates): Press and hold Shift-Option-Command-R.
How do you factory reset a Mac computer?
To reset your Mac, first restart your computer. Then press and hold Command + R until you see the Apple logo. Next, go to Disk Utility > View > View all devices, and choose the top drive. Next, click Erase, fill out the required details, and hit Erase again.
How do I reinstall OSX without Internet?
Installing a fresh copy of macOS via Recovery Mode
- Restart your Mac while holding down the ‘Command+R’ buttons.
- Release these buttons as soon as you see the Apple logo. Your Mac should now boot into Recovery Mode.
- Select ‘Reinstall macOS,’ and then click ‘Continue. ‘
- If prompted, enter your Apple ID.
How do I reinstall Macintosh HD?
Enter Recovery (either by pressing Command+R on an Intel Mac or by pressing and holding the power button on a M1 Mac) A macOS Utilities window will open, on which you will see the options to Restore From Time Machine Backup, Reinstall macOS [version], Safari (or Get Help Online in older versions) and Disk Utility.
How do I install the latest version of OSX on an old Macbook?
Restart your Mac while holding Option/Alt (depending on when it was made) to access Startup Manager. Select the bootable installer and click Enter. Your Mac should then open in Recovery mode. Click Reinstall macOS and wait for macOS Catalina to be installed on your machine.
Does reinstall macOS delete data?
2 Answers. Reinstalling macOS from the recovery menu does not erase your data. However, if there is a corruption issue, your data may be corrupted as well, its really hard to tell. … Reinatalling the os alone does not erase data.
How do I reinstall OSX Catalina from USB?
Then follow these steps:
- Use the mouse pointer or the arrow keys on your keyboard to select the disk called Install macOS Catalina in the drive list that appears on the screen.
- Once the USB drive has booted, select Disk Utility from the Utilities window, choose your Mac’s startup drive from the list, and click Erase.
How do I install Windows on a new hard drive without the disk?
To install Windows 10 after replacing the hard drive without disk, you can do it by using Windows Media Creation Tool. First, download the Windows 10 Media Creation Tool, then create Windows 10 installation media using a USB flash drive. Last, install Windows 10 to a new hard drive with USB.
How do I select a disk to install OSX?
Install macOS
- Choose Reinstall macOS (or Reinstall OS X) from the utilities window.
- Click Continue, then follow the onscreen instructions. You’ll be asked to select your disk. If you don’t see it, click Show All Disks. …
- Click Install. Your Mac restarts after installation is complete.
How do I restore my Mac without reinstalling operating system?
How to Wipe Everything Off a Hard Drive Except the OS
- Windows. Click the Start button and select “Control Panel.” …
- Mac. Click the Apple menu and select “Restart.” Hold down “Command-R” while your Mac restarts. …
- Manual Restoration on Windows. …
- Manual Restoration on Mac.
How do I factory reset my iMac g4 without CD?
Restart the iMac and, as soon as you hear the startup chime, press and hold the t key. Continue holding until the display shows what appears to be a screensaver: Look at the other computer–the hard drive in the iMac should appear on its desktop and be accessible for file retrieval or wiping.
How do I boot my Mac into recovery mode?
Reboot your Mac. Hold down Option/Alt-Command-R or Shift-Option/Alt-Command-R to force your Mac to boot into macOS Recovery Mode over the internet. This should boot the Mac into Recovery Mode.