![]() There are some universal commands, like the Option boot loader menu, which will change out the startup disk on system boot.Again, keep in mind there is some difference between a Power PC Macintosh and an Intel based Macintosh, and of course, the Mac hardware will matter for these as well. These boot commands come directly from Apple, and they’re sure to work on any older Mac model. ![]() Start up in Single-User mode (command line) If you can't start up your Mac and have an non-bootable optical disk stuck in the Mac's internal optical drive, you can eject the disk prior to startup by holding down the mouse/trackpad. Press Cmd-Opt-Shift-Delete during startup When the erase is complete, press Command-Q to quit Disk Utility and return to the utilities window. Hold Mouse button down immediately after powering onīypass primary startup volume and seek a different startup volume (CD, etc.) Mac startup key combinations To use any of these key combinations, press and hold the keys immediately after pressing the power button to turn on your Mac, or after your Mac begins to. Click the Erase button or tab on the right side of the window, then enter these details: Name: Macintosh HD Format: Mac OS Extended (Journaled) Scheme (if shown): GUID Partition Map Click Erase, then click Erase to confirm. ![]()
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