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- #Mac startup commands a1278 how to#
- #Mac startup commands a1278 serial number#
- #Mac startup commands a1278 install#
(You will not lose your data.) Select Macintosh HD as the target volume and let the installer repair your Mac. 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.
#Mac startup commands a1278 how to#
When the Utilities menu appears, choose Reinstall macOS. Here’s how to turn off startup programs Mac won’t use in System Preferences: On your Mac menu bar, select the Apple logo on the left side Select System Preferences Select Users & Groups Choose your ID from the list Note: if you’re the only user on your Mac, you may only have one profile, and won’t need to choose a user from a list. 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. Since your Mac is not working normally, you can invoke Recovery Mode by holding Command-R at Startup.
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1) First, use Disk Utility to Repair/First Aid your drive. If nothing more happens, it is more likely the latter. Your Mac should proceed to boot Recovery Mode using the flash drive. If you leave it alone for a few minutes and it discovers MacOS and boots up, the problem is the former. When the progress indicator appears, press and hold the left Shift key.
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You may lose unsaved changes in open documents. After a moment, press the power button again to start your Mac.
#Mac startup commands a1278 install#
Use the arrow keys to select Install macOS High Sierra, then hit Return (Enter). Press and hold the power button on your Mac until it shuts off. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced.
#Mac startup commands a1278 serial number#
Because there are 12 MacBook and MacBook Pro models that match the A1278 model number, you may wish to lookup yours by Model ID or Serial Number for greater precision. If any problems are found, repeat until clear. Enter Mac or Apple Device Identifier: Keywordsa1278. Step 5 Launch Disk Utility in Recovery mode (see Step 1.) Select your startup volume, then run Repair Disk. Release when you are presented with various startup disks to choose from. Sometimes a boot failure can be resolved by resetting the NVRAM. Once you’ve made a bootable installer, connect it to your malfunctioning Mac and hold the Option key while turning it on. So, when your Mac wont boot past the sign of crossed-out circle. First Aid in Disk Utility can find and repair errors that lead to Macs unexpected behaviors that prevent your Mac from turning on. You may also see the circle with a line through it on your Mac if the Macintosh HD is corrupted. Make sure your flash drive is named MyVolume before using the Terminal command. Step 2: Repair the startup disk with Disk Utility. Connect an empty flash drive to the other Mac and create a bootable installer using the steps in this article: If you see a circle with a slash, your macOS system folder is likely damaged.īased on your current circumstances, you’ll need to use another Mac in order to repair yours.
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