Hi Alan, Do you have the Mavericks Installer on your 2012 iMac? If so you are best to follow these instructions below:
Perform A Clean Install of Mavericks (OS X 10.9) Installing Mavericks via Target Disk Mode If you have a second Mac in your house the process is easy; simply attach the Mac you want to install the clean copy of Mavericks on to your other Mac using Target Disk Mode and erase the drive. Otherwise you are going to have to Install Mavericks on an external disk first before you can continue. Long and the short of this is you need to be running a Mac Operating System from another Drive other than the one you want to do a clean install on for this process to work. For the purposes of these directions the process will be done using another machine. Formatting the Target Volume Connect your machine to another Mac with a FireWire or lightning cable. Boot the target machine while holding down the T key on the keyboard. This will cause the machine to boot up in target disk mode. You will know you have done this properly when a FireWire Icon or Lightning Icon appear on the screen. If the Apple Logo appears you did it wrong and will need to start over. Once you are in target disk mode you should see the drive appear in the finder of the machine it is connected to. Launch Disk Utility from your /Applications/Utilities directory and select the drive of the machine in target disk mode. Now is a good time to stop and think about if you backed up everything you needed from the drive you are about to erase because there is no going back. Select Erase, set the format to Mac OS Extended (Journaled) and enter the name of the Volume. The standard name for the primary volume is Macintosh HD but you can name it what ever you want. Now is a good time to stop and think about if you backed up everything you needed from the drive you are about to erase cause there is no going back. Once you are sure you have backed up everything you need, click erase. You will be presented with a prompt saying are you sure you want to do this all the data on the drive will be erased. Did you back everything up? If you are sure you are ready to continue click erase. You drive will now be erased, the process should only take a few seconds. Once the erase process is complete quite disk utility. Installing Mavericks Launch the Mac OS Mavericks Installer application from the USB Key or External Drive. Click through the prompts until you are presented with the drive selection screen, select show all disks and select the newly erased volume from the previous steps. You will know you are selecting the correct volume because the disk colour will be orange. Click Install and now wait. The first phase of the installation should take 3 – 10 minutes to complete at which point your machine will reboot. During this wait period you will suddenly find yourself wondering if you actually did backup everything you needed from the drive you just erased Once your machine has restarted, the second phase of the installation will occur and this will take around 30 minutes to complete. You wont have to do anything during the process. After all the waiting, simply shutdown both the machines and disconnect the Lightning or Firewire Cable and reboot. It is possible that the machine you did the installation will be confused for a minute since it is expecting to be booting from the connected machine, it will take a minute but the installation machine should find the operating system on its own drive and boot from that. If it doesn’t reboot holding down the option key and select the primary drive of the machine to boot off of. Cheers, Ronni 17" MacBook Pro 2.3GHz Quad-Core i7 “Thunderbolt" 2.3GHz / 8GB / 750GB @ 7200rpm HD OS X Yosemite 10.10.1 Windows 7 Ultimate (under sufferance) > On 5 Dec 2014, at 12:33 pm, Alan Smith <[email protected]> wrote: > > Hello again > > First I’ll put the question, then give some background details. > > For a clean install of OS X Mavericks to an erased HD, do I need to install > OS X Snow Leopard 10.6.8 as an intermediate step? > > The backgound. My late 2009 iMac suffered a breakdown a few weeks ago. With > wamug help (particularly from Ronni) the iMac is now functioning well. As > the “cause” of the breakdown was not identified, the iMac is on a “use with > care but don’t rely on it” status. > > I want to do a comple erasure of the hard drive (and zero all data) and > re-install Mavericks. > > My plan was to use the original Snow Leopard 6.1 install DVDs and upgrade the > iMac to 10.6.8. Then install Mavericks via a bootable installer of the app. > Next update Mavericks with the OS X 10.9.5 combo update, and finally install > the OS X Supplementary update. I realise other apps and data would have to > be re-installed, and preferences all set up again. > > I have the Mavericks bootable installer and appropriate update .dmg files for > Snow Leopard and Mavericks. > > My belief was that Mavericks will only install over Snow Leopard 10.6.8. > However on perusing the Macworld articles on installing Mavericks, I found an > interesting postscript, copied here in full: "Note that the installer lets > you choose any drive that has OS X 10.6.8 or later installed or any blank > drive. (The latter is what you would choose if you wanted to do a “clean” > install that contains none of your data, applications, or settings from your > current installation of OS X.)” === Note the “… or any blank drive”! > > Hence the question, "Do I need to install OS X Snow Leopard as an > intermediate step?" Or was that applicable only when the user wanted to > download Mavericks from the App Store? > > Regards, > Alan > > Alan Smith > Late 2012 iMac 27" Intel Quad Core i5 Fusion 3.2GHz 8G RAM - OSX 10.9.5 > Mavericks > Late 2009 iMac 21.5" Intel Core 2 Duo 3.06GHz 12G RAM - OSX 10.9.5 Mavericks > iPhone5; iPad2; ATV2 >
-- The WA Macintosh User Group Mailing List -- Archives - <http://www.wamug.org.au/mailinglist/archives.shtml> Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml> Settings & Unsubscribe - <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug>
