20-Inch iMac (Early 2009) Hard Drive Installation Video - YouTube
Install memory in an iMac - Apple Support
iMac (20-inch Early 2009) Intel Core 2 Duo 2.66GHz, 4GB RAM, 320GB HDD A1224 | eBay
8GB -2x4GB Memory Ram Upgrade 20" Apple iMac 9.1 2.66GHz Core 2 Duo Early 2009 | eBay
iMac (2009) RAM & Storage Upgrades
Someone gave me this unwanted Mac, anyone know if you can upgrade the graphics cards on these ? Keep seeing conflicting information it's a 24" early 2009 imac : r/mac
APPLE IMAC EARLY 2008, Core 2 Duo 2.66GHz, 4GB RAM, 20”, no HDD EUR 65,00 - PicClick IT
APPLE IMAC 20" A1224 Mid 2007 Intel Core 2 Duo 250GB HDD 4GB RAM MacOS X 10.11 EUR 120,00 - PicClick IT
20″ iMac (Early 2009) | Low End Mac
Early 2009 model iMac Computer, DDR3 8GB (2x4GB) RAM Replacement - YouTube