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New iMac won't boot into Lion

S

seble

macrumors 6502a
Original poster
Sep 6, 2010
972
163
Have Lion on an external HD, and a piece of software is playing up on this imac so wanted to boot into lion.

When I select the Lion external HD as bootup disk it just comes up with a barrier symbol on the screen (circle with line across it). Does that mean because my machine shipped with ML, it won't boot Lion?

Thanks
 
simsaladimbamba

simsaladimbamba

Guest
Nov 28, 2010
22,670
30
located
If it is a late 2012 Mac, yes, as Mac OS X 10.7 Lion does not contain drivers for such hardware. If it is an early 2012 Mac, you need 10.7.5 on the external HDD to boot from it.
 
maflynn

maflynn

macrumors Haswell
May 3, 2009
73,448
43,368
On Macs the lowest version of OSX you can use is the version that it came with. So if you're trying to boot into an older version, i.e., 10.7, then that will not work
 
simsaladimbamba

simsaladimbamba

Guest
Nov 28, 2010
22,670
30
located
maflynn said:
On Macs the lowest version of OSX you can use is the version that it came with. So if you're trying to boot into an older version, i.e., 10.7, then that will not work
Click to expand...

Though there are exceptions, like the late 2011 MacBook Pros for example.
 
Last edited:
S

seble

macrumors 6502a
Original poster
Sep 6, 2010
972
163
maflynn said:
On Macs the lowest version of OSX you can use is the version that it came with. So if you're trying to boot into an older version, i.e., 10.7, then that will not work
Click to expand...

simsaladimbamba said:
Though there are exceptions though, like the late 2011 MacBook Pros for example.
Click to expand...

Thought that would generally be the case. Oh well, I'll have to think of something else. Thanks guys.
 
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