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Old Aug 26, 2013, 10:21 PM   #1
swennyhenny
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dual boot issue Mountain Lion and Snow Leopard

iMac 27" mid 2010 now running Mountain Lion

wish to create dual boot Snow Leopard and Mountain Lion to run older scanner and other peripherals.

Original OS X install disc gives error message "you can't use this version… you have 23.1.1

Created time machine backup.

Created bootable Mountain Lion USB

Created bootable Snow Leopard USB

Booted iMac from Mountain Lion USB and erased HD

Attempted to boot from original start up disc but it hangs on Apple logo screen

Attempted to boot from Snow Leopard USB and hangs at same point

Attempted to boot from Snow Leopard retail disc and hangs at same point.

Boots every time from ML USB

When I boot holding OPTION I can select from 3 different start up discs, but only ML gets past the Apple logo screen.

What is the reason why the iMac, which shipped from memory with
Snow Leopard, will now not start up from SL even when the HD has been erased?
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Old Aug 27, 2013, 06:14 AM   #2
BrianBaughn
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Where did you buy the iMac? I'm wondering if you've actually got the original installer disk.
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Old Aug 28, 2013, 07:13 AM   #3
swennyhenny
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iMac came from Apple direct, disc was in the box.

I'm totally baffled.
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Old Aug 28, 2013, 07:51 AM   #4
Bruno09
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Quote:
Originally Posted by swennyhenny View Post
Booted iMac from Mountain Lion USB and erased HD
Hi,

did you erase "Macintosh HD" or the whole disc ?

Il you only erased "Macintosh HD", the (Mountain Lion) Recovery HD is still here, and you won't be able to use the Snow Leopard Installer.

When you erase the WHOLE disc, the Recovery HD will be erased too, thus you will be able to boot from SL Install disc or bootable USB.
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Old Aug 28, 2013, 09:38 AM   #5
Dave Braine
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You might want to have a look at this on another forum on the same topic:
http://www.mac4mac.co.uk/viewtopic.p...it=dual#p42589
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Old Aug 29, 2013, 02:54 AM   #6
swennyhenny
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Good point, is the WHOLE disc erased?

Will try this tonight and update.

Thanks!
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Old Aug 29, 2013, 07:14 PM   #7
swennyhenny
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OK so I've double checked that the entire HD was erased and used the secure zero out option which took a couple of hours.

All startup discs still hang at the Apple logo screen except ML.

Going to try target disc mode next with a borrowed Mac.
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