|Aug 26, 2013, 10:21 PM||#1|
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?
|Aug 28, 2013, 07:51 AM||#4|
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.
|Aug 28, 2013, 09:38 AM||#5|
You might want to have a look at this on another forum on the same topic:
PPC Mini, 10.4.11, Intel Mini, 10.6.8, White MacBook 10.9.2
iPhone 3GS, using o2 PAYG
|Aug 29, 2013, 07:14 PM||#7|
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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