Currently Being ModeratedJan 16, 2012 2:24 PM (in response to darlingent)
Downgrade Lion to Snow Leopard
1. Boot from your Snow Leopard Installer Disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area. If it does not say "Verified" then the drive is failing or has failed and will need replacing. SMART info will not be reported on external drives. Otherwise, click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID then click on the OK button. Click on the Partition button and wait until the process has completed.
4. Quit DU and return to the installer. Install Snow Leopard.
This will erase the whole drive so be sure to backup your files if you don't have a backup already. If you have performed a TM backup using Lion be aware that you cannot restore from that backup in Snow Leopard (see below.) I suggest you make a separate backup using Carbon Copy Cloner 3.4.1.
If you have Snow Leopard Time Machine backups, do a full system restore per #14 in Time Machine - Frequently Asked Questions. If you have subsequent backups from Lion, you can restore newer items selectively, via the "Star Wars" display, per #15 there, but be careful; some Snow Leopard apps may not work with the Lion files.
Currently Being ModeratedJan 18, 2012 9:58 AM (in response to Kappy)
Kappy, thanks for the tip. However, the Snow Leopard DVD (10.6.3 provided by Apple Support) doesn't work. When I try to install, I get this dialogue box: "'You can't use this version of the application Install Mac OS X with this version of Mac OS X. You have Install Mac OS X 23.1.1"
I have attempted to run Snow Leopard (10.6.6) from an external drive and it freezes the machine.
Currently Being ModeratedJan 18, 2012 10:09 AM (in response to darlingent)
Which DVD do you have? The machine you bought would probably have come with drivers for a later version, including even the 10.6.6, and that's why it may not be working. You need to call Apple with your serial # and ask for the discs specific to your machine.
Currently Being ModeratedJan 18, 2012 10:24 AM (in response to darlingent)
The machine you have probably needs a later version of Snow Leopard than the version you have. According to my information it would have come with a build of 10.6.6 which means you would need 10.6.7 or later on a retail disc. I don't know if there are any retail discs with that version.
What you can do is this:
- Get a USB flash drive of 16 GBs or larger.
- Install the Snow Leopard you have onto the flash drive.
- Download Mac OS X 10.6.8 Update Combo v1.1.
- Install the 10.6.8 Combo Update onto the flash drive system.
- Boot your iMac with the flash drive (restart and hold OPTION key for boot manager.)
- Select the flash drive icon then click on the arrow button below the icon.
- Use Disk Utility to erase the internal hard drive.
- Clone the flash drive system to the internal drive using the Restore option of DU.
You will need to do the above using a computer that will boot from the Snow Leopard DVD your have since it doesn't work with your iMac.
Currently Being ModeratedJan 18, 2012 12:20 PM (in response to Kappy)
Kappy, that's a great tip. But I would think that, as most Flash drives will come set for PC use, the flash drive should first be set up to use the GUID Partition Table (GPT) and Formatted Mac OS Extended (Journaled.)
Currently Being ModeratedJan 18, 2012 12:23 PM (in response to WZZZ)
1. Open Disk Utility in your Utilities folder.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Security button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
Steps 4-6 are optional but should be used on a drive that has never been formatted before, if the format type is not Mac OS Extended, if the partition scheme has been changed, or if a different operating system (not OS X) has been installed on the drive.
Currently Being ModeratedJan 18, 2012 12:43 PM (in response to WZZZ)
I like to zero out brand new drives just to be sure there won't be any sector errors of any kind. I know it's a little overkill or being overly cautious. But I've had drives that simply would not boot or work properly until they were zeroed. So I do it for any new drive that has never been configured for a Mac.
For flash drives it goes pretty quickly. One might be reluctant to do it on a 3 TB drive.
Currently Being ModeratedJan 18, 2012 12:53 PM (in response to WZZZ)
Hey, you never know. I have two Kingston Traveler 8 and 16 GB flash drives that work wonderfully with everything but my Macs. Simply will not boot them no matter what. They will boot Windows machines, they will boot non-Apple computers running OS X, but none of my Macs. Nothing has ever made them work on the Macs other than for data. I've used any number of other brands without a problem - Transcend, PNY, Lexar have all been fine. Verrry strange.
Currently Being ModeratedJan 31, 2012 4:23 PM (in response to Kappy)
Sorry to be so long in answering. Thanks for the help!
Had to order the flash drive (Kingston 32 GB), then followed your advice using an older MacBook Pro running 10.6.8. Slow, but it works.
While waiting for all of this, got into a loop at Apple trying to get a start-up disc with 10.6.6 - no way. The previous disc they sent (10.6.3) is the only one available. Was bounced from Order Support to AppleCare to Consumer Sales and back twice. Finally transferred to a Senior Advisor who said they could not supply a start-up disc and wanted to know how I was able to get Snow Leopard to run on the machine. Had a quite long and very interesting conversation with him. He hinted that running Snow Leopard on this machine could have some unintended consequences from anomalies within the hardware (e.g., RAM, etc.) and with residual effects from Lion. He apologized for the mistake made by Live Chat (that the machine came with Snow Leopard installed). I suggested that I may send the machine back and try to find another refurb with Snow Leopard and he suggested I look for an “early - 2011.”
“Early-2011”? A different RAM in 2010 models? Very curious...
All this has left me wondering about AppleCare and whether it would be affected by this OS change? Any thoughts?
Currently Being ModeratedJan 31, 2012 7:19 PM (in response to darlingent)
There is no Snow Leopard DVD with 10.6.6 except those shipped with a computer. The newest models do not come with Snow Leopard any more. Some may in fact have hardware changes that would adversely affect running Snow Leopard. This is an area in which we have little information.
Currently Being ModeratedSep 11, 2012 8:25 PM (in response to darlingent)
I have just found this fix for this issue.
Very cheap - & I would say a legitimate workaround, that provides a final solution.
I bought a refurbished iMac 27" (from May 2011) & it came with Lion and no discs. I know this mac will boot snow lepoard but not earlier than 10.6.7 (or.6 maybe).
Anyway, Apple are now selling retail Snow Leopard for $20.99 (I'm in Australia so that's AUD).
Ok this is only 10.6.3 BUT...
***use this excellent hint... http://hints.macworld.com/article.php?story=20120123175902871 and problem solved, bootable 10.6.7 installer!
I'm at the carbon copy cloner stage now, so all going to plan I shoudl eb running Snow Leopard by this evening.
Thanks to those helpful folk at MacOS hints.
hope this helps somebody else in my position.