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<blockquote data-quote="harryb2448" data-source="post: 1759609" data-attributes="member: 42497">G'day and welcome to the forums.What model is it?&nbsp; There is a Mac Pro 1.1 2006&nbsp; A Mac Pro 2.1 also 2007/2008.&nbsp; A Mac Pro 3.1 2008.&nbsp; A Mac Pro 4.1 2009.&nbsp; A Mac Pro 5.1 2010.&nbsp; A Mac Pro 5.1 Server 2010.&nbsp; A Mac Pro 5.1 2012.&nbsp; A 5.1 Mac Pro Server Server late 2012. The Mac Pro 6.1 ;ate 2013 known as the Black Trash Can.They each have different hardware, memory etc.&nbsp; We do need to know the model.&nbsp; Tne Lion operating system may well indicate it is the Mac Pro 1.1.&nbsp; Have you installed any of the memory?&nbsp; Be aware Macs are VERY fussy about memopry and must have low density modules, not cheaper PC high density modules.&nbsp; This is what I would be checking out first.What is on 'these old hard drives'.&nbsp; If they are out of say a MacBook, Mini etc expect trouble.&nbsp; Best option is to always format drives of a second hand machine and do a clean install.</blockquote>

[QUOTE="harryb2448, post: 1759609, member: 42497"] G'day and welcome to the forums. What model is it? There is a Mac Pro 1.1 2006 A Mac Pro 2.1 also 2007/2008. A Mac Pro 3.1 2008. A Mac Pro 4.1 2009. A Mac Pro 5.1 2010. A Mac Pro 5.1 Server 2010. A Mac Pro 5.1 2012. A 5.1 Mac Pro Server Server late 2012. The Mac Pro 6.1 ;ate 2013 known as the Black Trash Can. They each have different hardware, memory etc. We do need to know the model. Tne Lion operating system may well indicate it is the Mac Pro 1.1. Have you installed any of the memory? Be aware Macs are VERY fussy about memopry and must have low density modules, not cheaper PC high density modules. This is what I would be checking out first. What is on 'these old hard drives'. If they are out of say a MacBook, Mini etc expect trouble. Best option is to always format drives of a second hand machine and do a clean install. [/QUOTE]

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