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I am unable to upgrade my iMac to Snow Leopard even though it seems to meet all the requirements. The iMac has:

  • Intel Core 2 Duo processor
  • DVD drive
  • 4GB RAM
  • 185GB of storage available.

When I try to install, it simply says "Mac OS X Snow Leopard cannot be installed on this computer."

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What version of OSX are you currently using on your iMac (you can find out in  -> "About My Mac")? Does booting from the Snow Leopard DVD work (reboot with the DVD inserted, hold Alt/Option when the chime sounds)? – pmdj Aug 4 '12 at 19:08
Are you trying got use a disc that came with a different Mac? – robmathers Aug 4 '12 at 19:19
OS X 10.5.8. Yes, I am using the disk that came with my MacBook Pro. – Donnie Aug 4 '12 at 20:16
up vote 0 down vote accepted

I got a different disc and it worked. Apparently, the disc I originally tried was only to be used on the computer it came with.

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Yes, the discs that come with a computer are keyed to only work with that specific model, you need to use a retail disc to upgrade another computer. – robmathers Aug 5 '12 at 2:31

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