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Mac mini with OSX on external hard drive crashing upon boot

I have a Mac Mini with OSX Lion, which was installed on a passport external hard drive, and plugged into the Mini.

Was working 3 weeks ago, but now when I power on, get chime, mac logo, and long progression bar on display. As soon as it reaches 100%, powers off instantly.


Tried holding down shift key upon restarting, but nothing changes.


Help, I really would like my Mac back...

Mac mini (Mid 2011), iOS 7.0.6

Posted on Apr 23, 2015 8:21 AM

Reply
7 replies

Apr 23, 2015 8:25 AM in response to jetster1

Have you tried repairing disk permissions in Safe Mode?


- Shut down your Mac

- Wait until your computer turns off and after that press the Power button

- Right after you hear the startup tone, press and hold the Shift key

- Release the Shift key when you see a grey Apple sign and the progress bar below this sign

- Once you see Desktop, start a Disc Utility scan to detect and repair file system errors (don't forget to choose your main hard drive)

- Click on Verify Disc and then, if asked to fix problems, on Repair Disk

- After this, click on Verify Disk Permissions and then on Repair Disk Permissions

- After the process is finished, shut down your Mac and turn it back on after about 30 seconds


Hope this helps!

Apr 24, 2015 8:48 AM in response to jetster1

Try to restore your Mac to factory settings. First of all, save all the files you want to keep (photos, documents etc.) on a separate drive or in the cloud. Make sure you are connected to the Internet. After that, follow these steps:

  1. Restart your Mac. Once it restarts and the grey screen appears, press and hold the Command and R keys.
  2. Select Disk Utility and click Continue.
  3. Select your startup disk on the left and click the Erase tab.
  4. Choose Mac OS Extended (Journaled) from the Format menu, enter a name, and then click Erase.
  5. Select Reinstall OS X, click Continue, and then follow the instructions on your screen.

Mac mini with OSX on external hard drive crashing upon boot

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