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Mid-2011 21.5" iMac / macOS 10.13 High Sierra (3 left) - computers - by owner - electronics sale - craigslist
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Mac OS CATALINA on a 2011 IMAC. I kept hearing it won't work because of the video card and would make my Mac unable to use but it is working for me.
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Apple iMac 21.5" All-in-One Desktop Computer i3 3.07GHz 4GB Ram 500GB HDD Mac OS High Sierra MC508LL/A w/ Keyboard & Mouse - GRADE B
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Apple iMac 27″ Mid 2011 Core i5 3.1GHz 12GB 1TB DVDCDRW Wifi macOS 10.13 High Sierra – Refresh Computers Online Marketplace
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iMac "Core i5" 2.5 21.5" (Mid-2011) Specs (Mid-2011, MC309LL/A, iMac12,1, A1311, 2428): EveryMac.com
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