If your Mac won't boot up, there are a few steps you can take. Your Mac will then begin booting from that drive. Select the one you want to use and press Return or Enter on your keyboard. This will take you to OS X's Startup Manager, which will show all of the bootable drives connected to your computer. Then press and hold the Option key while your Mac is starting up. To force your Mac to boot from a USB drive, insert the USB boot media into an available USB slot. Finally, follow any additional instructions to complete the installation process. Follow the onscreen instructions to choose a language and agree to Apple's terms and conditions, then select eiter “Install macOS” or “Reinstall macOS” from the main menu. Once it has finished booting, you will be presented with a welcome window. When you see the Apple logo and spinning gear, release the C key to boot from the DVD. Next, restart the Mac and hold down the C key while the computer starts up. ![]() First, insert the Install macOS Lion DVD into your Mac's optical drive. Installing macOS from a DVD is a relatively straightforward process.
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