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How to Upgrade Memory in a Late 2009 21.5-inch or 27-inch iMac - YouTube
Apple iMac Late 2009 Intel Core 2 Duo (2016 Review) - YouTube
Apple iMac A1311 21.5" Desktop - MB950LL/A (October, 2009) for sale online | eBay
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Review: 21.5-inch 2012 iMac takes two steps forward, one step back | Ars Technica
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Apple iMac 21.5in (Late 2009) Review: Apple beefs up its consumer desktop PC with a faster CPU and an energy-efficient display - Back to School - Desktop PCs - PC World Australia
How to Upgrade the iMac 21.5-inch (Late 2009)
Identify your iMac model - Apple Support
OEM 21.5" Glass Panel Front For LCD Display Apple iMac A1311 Late 2009 2010 2011