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オリジナル投稿者: Jose M. Velez ,

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I just upgraded my 21.5 inch late 2009 iMac from a ATI 4670 with 256MB to a ATI 6750 with 512MB from a 21.5 inch late 2011 iMac but it just has a black screen with sound i don't know if it's a comparability issue or I did something wrong if someone knows something please let me know.

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