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<blockquote data-quote="pigoo3" data-source="post: 1383581" data-attributes="member: 56379">Since this is a 2008 Mac Pro...what is it's history?&nbsp; Have you owned it since 2008...or did you buy it used recently?Ram for Mac Pro's can be &quot;picky&quot;...so it must be the correct type of ram.&nbsp; If you bought it used...maybe the previous owner installed the wrong ram.If you go to the Apple Drop-down menu...and choose &quot;About This Mac&quot;...how much ram does this window say the computer has?- Nickp.s.&nbsp; If &quot;About This Mac&quot; only reports 8 gig of ram...there is also a very special way that ram must be installed in Mac Pro's (matched pairs...and in the proper slots).&nbsp; So even though the Mac Pro has all eight ram slots full with 2gig DIMMS in each &amp; every slot...maybe there are slight differences in the ram that makes them &quot;not matched&quot;.&nbsp; Just thinking of any reason why all 16 gig is not being recognized.</blockquote>

[QUOTE="pigoo3, post: 1383581, member: 56379"] Since this is a 2008 Mac Pro...what is it's history? Have you owned it since 2008...or did you buy it used recently? Ram for Mac Pro's can be "picky"...so it must be the correct type of ram. If you bought it used...maybe the previous owner installed the wrong ram. If you go to the Apple Drop-down menu...and choose "About This Mac"...how much ram does this window say the computer has? - Nick p.s. If "About This Mac" only reports 8 gig of ram...there is also a very special way that ram must be installed in Mac Pro's (matched pairs...and in the proper slots). So even though the Mac Pro has all eight ram slots full with 2gig DIMMS in each & every slot...maybe there are slight differences in the ram that makes them "not matched". Just thinking of any reason why all 16 gig is not being recognized. [/QUOTE]

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