Q: 2011 iMac powers off during startup in all modes
Specs:
iMac (Mid-2011) 2.5GHz Core i5 1TB (SSHD) 12GB (RAM)
Running OS X 10.10. Yosemite
I was having trouble uninstalling some programs (Adobe CC items, for whatever relevance that may be) so restarted my machine in Safe Mode, thinking my re-installation tasks may be more cooperative in Safe Mode.
I'd expected a Safe Mode boot to be slower than usual, but this was inordinately slow...and then at the near-halfway point of the status bar, the machine shut down (didn't auto-restart).
I tried Safe Mode boot again. Same thing happened.
I reset NVRAM, and tried to boot normally...but the same thing happened — both the excessively slow progress bar, and shutting down halfway through.
I tried booting from Recovery HD, but it made no difference—I still had a slow progress bar, and the machine shut down halfway through.
I ran fsck -fy in Single User mode. Results:
** /dev/rdisk0s2
** Root file system
Executing fsck_hfs (version hfs-285).
** Checking Journaled HFS Plus volume.
The volume name is Macintosh HD
** Checking extents overflow file.
** Checking catalog file.
Incorrect number of thread records
(4, 25319)
** Checking multi-linked files.
** Checking catalog hierarchy.
** Checking extended attributes file.
Incorrect number of extended attributes
(It should be 502461 instead of 502462)
** Checking volume bitmap.
** Checking volume information.
** Repairing volume.
** Rechecking volume.
*** Checking Journaled HFS Plus volume.
[...this repeats as previously, with same errors, three times. Then:]
** The volume Macintosh HD could no be repaired after 3 attempts.
*****The volume was modified*****
What next?
iMac
Posted on Jan 19, 2016 11:16 PM