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denem

(11,045 posts)
5. Heres a suggestion.
Thu Apr 25, 2013, 12:24 AM
Apr 2013

1. Reset Parameter Ram
2. Boot holding down Option and select the recovery partition. If you don't have a recovery partition, attach another mac by a firewire cable. Boot the other mac in Target Disk mode, then restart iMac holding down Option, and select the other mac's boot disk.
3. Run Disk Utility (or DiskWarrior if you have it) on the iMacs boot disk.
4. Shutdown.
5. Reboot the iMac in Safe/Disk Check mode (Hold down shift on startup)
6. If you get to the desktop give it a few minutes then shutdown.
7. Then try a cold start.

Good luck.

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