Partition find and mount no partition found

Troubleshooting No Partition Found Errors During Startup

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When your computer fails to boot due to an error stating 'no partition found,' it can be frustrating and panic-inducing, especially if you've been using Mac OS X or later versions. Fortunately, there are several steps you can take to resolve this issue.

Step 1: Boot into Safe Mode

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Firstly, try booting your computer in safe mode by pressing the Shift key while turning it on or restarting from sleep/hibernation. This will load a minimal version of macOS without third-party extensions and some system preferences.

Step 2: Check Disk Utility for Issues

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Once you're booted into Safe Mode, immediately launch Disk Utility (or 'Disk Utilities' in older versions) by pressing Command + Option + Spacebar and selecting it from the resulting menu. From there:

a. Click on your main hard drive or SSD.

b. Select First Aid.

The process may take several minutes to complete, depending on the size of your disk. If Disk Utility finds any issues during this scan, you'll be prompted to repair them; click 'Continue' if asked.

Step 3: Use a Recovery Drive

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If none of the above steps resolve the issue or if you're still unable to boot into Safe Mode due to the same error message, it's likely that your Mac's recovery partition has become corrupted. In this case:

a. Insert both your original System Install DVDs/USB drives and system Repair DVD/USB drive.

b. Reboot while holding down Command + Option (or Command + Shift + F2 on older systems).

c. Select 'Reinstall macOS' from the Recovery Menu.

If you're prompted to select a startup disk, choose the correct one that contains your original installation media.

Step 4: Create an Emergency Bootable USB Drive

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As a last resort or as a precautionary measure for future emergencies:

a. Download and download either 'macOS High Sierra or later' from Apple's official website (or the corresponding version of macOS you're running) if not already done.

b. Follow the on-screen instructions to create an Emergency Boot USB drive.

Once complete, disconnect any external drives except your main hard disk/SSD and try booting again using this newly created emergency media.

If none of these steps resolve the 'no partition found' error during startup, it's possible that there may be a more serious hardware issue at play. In such cases, consider seeking professional assistance from an authorized Apple Support Center or Authorized Service Provider (ASP) for further diagnosis and repair.

Partition find and mount no partition found