How to Force Mac to Boot From a Disk
- 1). Insert the disc into your Mac’s optical drive. Choose “Restart” from the Apple menu.
- 2). Hold down the “Option” key. Choose the disk you want to boot your Mac from and click on it. The Mac will boot from the disk.
- 3). Press “Command,” “Option,” “Shift” and “Delete” all at once right after you restart your Mac. This will force the Mac to start from a CD or DVD.
- 4). Hold down the “C” key right after you press “Restart.” The Mac will search for a CD or DVD drive. When it finds the CD or DVD, it will boot from it.
