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All replies
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Helpful answers
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Mar 12, 2012 4:46 PM in response to WillieBby rkaufmann87,If your machine has the ability to boot into 64bit mode it will automatically with Lion. Lion is a 64 bit OS so it will default boot to 64 bit.
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Mar 12, 2012 4:49 PM in response to WillieBby Mike Sombrio,Willie, This says your iMac is too old to boot into 64 bit.
http://support.apple.com/kb/HT3770?viewlocale=en_US&locale=en_US
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Mar 12, 2012 6:26 PM in response to Mike Sombrioby rkaufmann87,Actually if you want to find out for sure if your iMac has the ability to run in 64bit then please open a Terminal session and copy and paste:
ioreg -l -p IODeviceTree | grep firmware-abi
paste it. If it returns EFI64 then it will run in 64bit just fine. However if it returns with EFI32 then the previous poster was correct.
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Mar 12, 2012 8:42 PM in response to WillieBby WillieB,Thanks for all the replies, folks!!
The terminal commands returned EFI64, so I'll make a Lion installer drive and give that a try on a backup and report back.
I found a post about Mountain Lion compatibility on another forum that said that the 7,1 model was
64-bit capable but disabled in firmware when released until more developers had a chance to update
their apps for 64-bit compatibility.
Thanks again!
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Mar 12, 2012 8:58 PM in response to WillieBby rkaufmann87,Your welcome.
BTW, when replying to a post, please click "Reply in the post you are replying to, othewise we cannot tell who your communication is directed to.