Contribution d'origine par : originalmachead ,
[http://www.apple.com/osx/specs/|Here's the spec's] ''aside from processor there's memory, free space and an 800 MHz system bus, apparently the earlier non-AL iMacs lack.'' Of course you ran Apple update for EFI/Firmware updates to your custom updated machine. Don't know how much you've stuck into this machine so far, but at a certain point '''you have know when to stop throwing good money after bad..'''.'' It's like you're trying to run a 600HP Hemi in a family sedan...'' there's just too many gremlins in the mix. See if you can run 10.7.4 if you can stop there and sell it. Take the money and put it towards a new machine... or an older MacPro. ''If this answer was helpful '''please remember to return and mark it Accepted'''.''