HT1338 is my MacPro 2x2.66Gh Dual Core Intel Xeon compatible with Mountain Lion

Hello,
Does anyone has an idea why I can't install Montain Lion on my MacPro Dual Core Intel Xeon 2x2.66Ghz ? Each time I try in the App Store, each time it is telling me it can't be installed on that coomputer.
I am up to date on 10.6.8 which is mimimum requirement for Montain Lion.
Thank you.

http://www.apple.com/osx/specs/

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http://browse.geekbench.ca/geekbench2/view/218641
The Mac Pro 4,1 Quad Core 2.66GHz with all its Nehalem glory gets a score of 9256.
http://browse.geekbench.ca/geekbench2/view/229504
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After attempting to get a friend's 3rd gen iPod to mount (only to retrieve data from it), I'm now getting a circle w/ a slash upon startup. it will, however, boot in "safe mode". My third year of AppleCare expired a little over a month ago, of course. Thought I'd try here before paying the $49 per incident support call, or reinstalling 10.6 fresh off disk, or restoring from Time Machine backup. And I figure that $50 would be spent for someone to tell me to do a fresh install or restore. I'd rather spend $100± on Disk Warrior, as this tower is aging, and I'd like to keep it for a while longer -- likely a smarter investment.
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If not... what would be the perfect monitor for it. Preferably something ideal for graphic design....

Your budget and how about color fidelity and accuracy?

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HT1338 is my MacPro 2x2.66Gh Dual Core Intel Xeon compatible with Mountain Lion

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