Je souhaite installer OS X Mountain Lion.

J'ai installé OS X snow leopard 10.6.8. Normalement, je peux désormais installer Mountain Lion. Mais, lors que j'essaie d'acheter Mountain lion, j'ai comme message "OS X mountain lion n'est pas compatible avec cet ordinateur".
Que dois-je faire ?

Choose About this Mac from the Apple menu, click on More Info, and check the model identifier against the following, which are the earliest Macs of each type that can run Mountain Lion:
iMac7,1
MacBook5,1
MacBookPro3,1
MacBookAir2,1
Macmini3,1
MacPro3,1
Xserve3,1
(79501)

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