Since your Mac is not working normally, you can invoke Recovery Mode by holding Command-R at Startup. 1) First, use Disk Utility to Repair/First Aid your drive. If nothing more happens, it is more likely the latter. 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. If you leave it alone for a few minutes and it discovers MacOS and boots up, the problem is the former. Hold these keys until the computer restarts and you hear the startup sound for a second time. Press and hold the Command-Option-P-R keys immediately after you hear the startup sound. These boot commands come directly from Apple, and they’re sure to work on any older Mac model. Locate the following keys on the keyboard: Command (), Option, P, and R.

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Insert it, restart the computer with the C or Option key held down, use the Disk Utility to erase the internal drive, and install the OS. Start up in Single-User mode (command line) If you can use that DVD, it'll have all the OS components on one, but not iLife. Also, SMC reset may be needed (that usually doesnt fix a missing boot partition, though). Wait until you hear the startup chime for the third time before letting go. Press Cmd-Opt-Shift-Delete during startup Start it and immediately hold down Command, Option, P and R keys at the same time. However, your Mac can’t boot normally when this issue happens, you need to enter the macOS Recovery Mode and then repair your startup disk using Disk Utility.

Hold Mouse button down immediately after powering onīypass primary startup volume and seek a different startup volume (CD, etc.) Since MacBook stuck on loading screen is a startup issue, which is related to the startup disk on your Mac, you can also use Disk Utility to repair the startup disk.

Mac startup commands a1278