Use the “Reinstall macOS” option in Recovery Mode to have your Mac automatically download the latest macOS installation files and reinstall its operating system. If the Disk Utility didn’t work, you can reinstall macOS on your Mac.

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The Disk Utility performs an “fsck” (file system check) operation, so you don’t need to run the fsck command manually. For example, if you installed RAM or swapped out a hard drive, you may want to try swapping back in the old hardware or just ensuring those components are securely seated in your Mac.Ĭlick the “ Disk Utility” option, click over to the First Aid tab, and try repairing your Mac’s disk. If you’ve recently opened up your Mac and fiddled with its hardware, that could have caused the problem. Try reseating all the cables-unplug them and then plug them back in-to ensure they’re securely connected. For example, if it’s a Mac Mini, ensure the video-out cable is connected securely to both the Mac Mini itself and the display. Color4260 / Check the HardwareĪssuming you’re using a Mac desktop, check that all its cables are correctly seated. It won’t necessarily boot immediately the moment after you plug it in. If you’re using a MacBook and its battery is completely dead, you may need to wait a few moments after plugging it in before turning it on. Try swapping out the charger or power cable, or using a different power outlet. Ensure your Mac is plugged into a power source.

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