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Helpful answers
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Apr 20, 2014 5:09 PM in response to Steve Erwinby den.thed,★HelpfulSnow Leopard 10.6 is the highest OS X that a Core Duo can be upgraded to.
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Apr 21, 2014 4:11 AM in response to den.thedby Steve Erwin,I am more concerned with issues like names and passwords that are already on the system not allowing me to upgrade the machine. I don't want to use my friend's name and passwords, for example.
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Apr 21, 2014 4:17 AM in response to Steve Erwinby Gary Scotland,Best practice when obtaining a used Mac is to wipe the drive clean then install the OS as a clean install.
Back up work files you have created, then follow this tutorial: How to Erase and Install