(As an aside, this went much more smoothly than expected thanks to a Time Machine backup, which meant that it really was a case of booting the new machine, attaching the Time Machine disk and it restored me back to where I was before the failure – just as the Apple advertising said it would, amazing!)Īnyway, this left me with the problem of a non functioning machine containing a hard drive that presumably still worked and contained all of my private data. My early 2006 iMac gave up the ghost a few days before Christmas and refused to respond at all to being switched on, so it was clear that something pretty terminal must be wrong with it and I replaced it with a new aluminium iMac. I don’t know of any way of resolving this problem in 2021.) I have linked to the Wayback Machine for his site, but the archive copy they have appears to be missing the crucial photos. After the installation process completes, your iMac will automatically reboot into OS X Mountain Lion.(Note: This post dates from 2009, 12 years ago at the time I add this update, and John Wood’s site referenced below has long since disappeared. For example, choose the hard drive you want to reinstall the operating system on and enter your Apple ID and password when prompted. The OS X Utilities window re-appears.Ĭhoose "Reinstall OS X" and click "Continue." Follow the directions to reinstall OS X Mountain Lion. Open the "Disk Utility" menu and choose "Quit Disk Utility" after the system displays the message that the disk has been successfully erased. The time for the process to complete depends on the amount of data on the disk. Click the "Erase" tab.Ĭlick the "Format" pop-up list and select "Mac OS Extended (Journaled)." Enter a name for the hard drive in the Name box and click "Erase." The system automatically erases the disk. If you only have one hard drive, it will be the only disk available.
If the system does not automatically connect to the Internet, select your wireless network from the Wi-Fi menu to establish a connection.Ĭhoose "Disk Utility" from the list of options to open the Disk Utility window and click "Continue."Ĭhoose the hard drive you want to clear. Release the keys after the OS X Utilities window opens.
Press the "R" and "Command" keys simultaneously and hold them when the system restarts.
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