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Mid 2011 imac 27" with new hard drive keeps shutting down randomly.

After a bad crash, the imac can no longer boot into desktop. I seem to have a stuck booting cycle with the horizontal progress bar progressing then reverting back to the spinning progress circle but never reaching desktop.

I can boot via an external hard drive with a system on and tried to backup the problem drive with superduper. But halfway through backing up the imac randomly shut down. I then restarted using the my external drive and backed up files manuallly.

I also tried installing mavericks on to the problem drive, but the install freezes at the end of the mavericks restart message.

Do you think I have a defective new hard drive? Or do you think it's another issue with the imac?

I may try another option of formatting the problem drive and reinstalling a completely clean system on to the drive.

  • did you try the fsck in terminal to see if it can fix the drive. – Ruskes Jul 9 '14 at 10:07
  • Not tried fsck, I will give it a go. – Ginger Mac Benn Jul 9 '14 at 10:27
  • Fsck did't work. Have formatted drive, but can't seem to reinstall any system. – Ginger Mac Benn Jul 11 '14 at 14:51

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