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Helpful answers
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Oct 2, 2016 5:56 PM in response to ALANJOLby Kenichi Watanabe,You can only run Leopard on an Intel-based Mac, if it originally came with Tiger or Leopard. Typically, the version of OS X on a particular Mac model cannot be earlier than its originally pre-installed OS X.
Why do you want to run Leopard?
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Oct 2, 2016 7:02 PM in response to Kenichi Watanabeby ALANJOL,Hi Kenichi
Thanks for your reply! I am running an intel- based Mac Originally it was probably Tiger and then I U/G to
OSX10.6.8 before I U/G to El capitan!!
Unfortunately I had CS6 etc. installed which the NEW OS won't allow me to open as it is saying they are PC
based softwares!
I have a OSX10.5 start up disc & I have seen in SET up that I can choose this OS selected without losing the current
OS if it is located in an external drive????
I am told Portioning is NOT the way to go???
ALANJOL
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Oct 2, 2016 7:15 PM in response to ALANJOLby Kenichi Watanabe,If it originally came with Tiger, it can run Leopard.
Unfortunately I had CS6 etc. installed which the NEW OS won't allow me to open as it is saying they are PC based softwares!
I think you mean PowerPC. Macs used PowerPC processors until the switch to Intel, which happen during the Tiger to Leopard timeframe. If you have a Snow Leopard installation disc, which you probably used to upgrade to 10.6.8, you can run Snow Leopard instead of going all the way back to Leopard. Snow Leopard can run PowerPC-based software like your CS6 software. After Snow Leopard (starting with Lion), PowerPC-based software can no longer run on Intel-based Macs.
If your Leopard (or Snow Leopard) startup disk is installed on an external drive, you can start up from it by choosing it in System Preference Startup Disk pane, and clicking Restart. Data on your internal drive is not affected. To change back, go to System Preferences Startup Disk pane again, and choose the El Capitan startup disk on your internal drive.
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Oct 2, 2016 7:38 PM in response to Kenichi Watanabeby ALANJOL,Thank you again Kenichi!!
That is good info. I gather I do not have too save any APPS. or files in doing this before switching OS's & if
I OPEN CS6 and save any files I have done I simply save them in the Ext. drive before
converting back to El Capitan??
ALANJOL
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Oct 2, 2016 7:43 PM in response to ALANJOLby ALANJOL,Kenichi
I have opened up about My Mac & have found it is a 3.2GHZ Intel Core i3
Does that change matters??
ALANJOL
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Oct 2, 2016 7:59 PM in response to ALANJOLby Kenichi Watanabe,Yes, you need to save your files before restarting the Mac. Where you save the files is up to you.
I have opened up about My Mac & have found it is a 3.2GHZ Intel Core i3
If that's your iMac, I don't think it originally ran Tiger or Leopard. This is a list of all iMac models
http://www.everymac.com/systems/apple/imac/index-imac.html
The earliest "3.2GHZ Intel Core i3" I see is from mid-2010. Find your particular iMac model on the list and click it to see its detailed profile page. Find what it says for Pre-Installed MacOS. That's the earliest version of OS X it can run. The iMac I'm looking at says that's 10.6.3, which is Snow Leopard. So, if you install Snow Leopard on external drive that is 10.6.3 or later (10.6.8 is last version of Snow Leopard), that iMac should start up from it. But not Leopard, because all versions of Leopard are earlier than Snow Leopard.
NOTE: PowerPC-based software can still run under Snow Leopard.
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Oct 2, 2016 8:09 PM in response to ALANJOLby ALANJOL,Kenichi
Thanks again It is Mid 2010 and that OS sounds familiar.
I will try everything you have suggested.
I will let you know my results after that.
Thanks again
ALANJOL