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Helpful answers
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Sep 25, 2015 11:00 AM in response to Eoin Sharkey1by D.Cohen,★HelpfulHi! I've once had the same issue. Unfortunately, I had to reinstall OS X it get it fixed. Try the steps below and if these steps don't work, use OS X Recovery and reinstall the OS.
Safe Boot:
- 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
- After your Mac boots up, restart it as you usually do.
If this doesn't help, follow the instructions below:
- 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 Disk Utility scan to detect and repair file system errors (don't forget to choose your main hard drive)
- Click on Verify Disk 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
Take a look at the steps suggested by Apple in this article:
https://support.apple.com/en-us/HT204267
Reinstall OS X:
Make sure you are connected to the Internet. After that, follow these steps:
- Restart your Mac. Once it restarts and the grey screen appears, press and hold the Command and R keys.
- Select Disk Utility and click Continue.
- Select your startup disk on the left and click the Erase tab.
- Choose Mac OS Extended (Journaled) from the Format menu, enter a name, and then click Erase.
- Select Reinstall OS X, click Continue, and then follow the instructions on your screen.
Hope this helps! -
Sep 25, 2015 11:12 AM in response to Eoin Sharkey1by Acm001,★HelpfulIf it was on and writing something to disk when it shut off it most likely corrupted some files. A reinstall may be only solution.
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Sep 25, 2015 11:08 AM in response to D.Cohenby Eoin Sharkey1,D.Cohen
many thanks for that. Useful input, given the nature of the event (sudden power cut), corruption of disks with OS must be a candidate ..
Apologies for not replying sooner, I thought I was 'subscribed' to this post (haven't used the Apple forum in a while), so didn't realise you'd replied.
Will try your suggested remedies this weekend and post back.
Cheers
Eoin -
by rkaufmann87,Sep 25, 2015 11:24 AM in response to Eoin Sharkey1
rkaufmann87
Sep 25, 2015 11:24 AM
in response to Eoin Sharkey1
Level 9 (58,956 points)
Photos for MacIF the re-install does not work, then the HD may have crashed. If you still have the original install discs that came with it run Apple Hardware Test in extended mode 2-3 times back to back. If errors appear on any pass, then you know you have a hardware problem. You have to run it multiple times because AHT does not always find errors on the first or second pass.
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Sep 26, 2015 1:38 AM in response to rkaufmann87by Eoin Sharkey1,Thanks RKaufmann87, DCohen & Acm001,
Booting into Recovery mode is a new thing for me and a neat facility. Sadly it seems to show that the hard drive is not just severely corrupted but possibly terminally dysfunctional.
Within Recovery mode I can use DU to verify/repair the disk neither will complete. Nor can I erase the disk, or mount it.
Re-installation is not possible since the disk is not presented as a target.
Booting into single-user mode reveals that /sbin/fsck -fy completes 3 cycles identifying an error but failing to fix it.
I am now turning my attention to rescuing remaining files on the disk.
There is a Time Machine backup to a separate disk-drive, unfortunately, as this is the only Mac in the household, I cannot view/verify the latest backup.
In single-user mode I can still view all the important files; however rescuing them doesn't seem straightforward since I cannot seem to mount (e.g.) a USB memory stick.
Any pointers towards recovery of files in single-user mode appreciated (I guess there may be other posts already , which will research later), as will rebuilding the machine with a new hard-drive.
KRs