I recently purchased 2011 21.5 iMac (Mid-2011) and I'm obsessed. : r/mac
Apple iMac 27-inch MC511LL/A (MID 2010). Core i5 @ 2.80GHz. 16GB RAM. 1TB HDD. High Sierra 10.13. for Sale in San Diego, CA - OfferUp
APPLE IMAC 2011 8GB DDR3 RAM OSX 10.13.6 High Sierra - Desktop Computers - Tracy, California | Facebook Marketplace | Facebook
Apple iMac i5 21.5" AIO Desktop Computer Core i5 2.5GHz 8GB 500GB Sierra 2011 and WIFI
I just bought a 2011 21.5" imac and reinstalled High Sierra. I then noticed these graphical issues. I hope the gpu isn't going out. Does anyone know what's going on? : r/mac
MacOS High Sierra Compatible Macs List | OSXDaily
Apple iMac (A1312) 27 Inch High Sierra Intel 2.7Ghz i5 1TB HDD 16GB RAM Mid 2011 | eBay
MacOS High Sierra Compatible Macs List | OSXDaily
Apple 27" iMac 8GB 1TB 2011/12 High Sierra | Laptop Workshop
Upgrade from OS High Sierra to OS Mohave - Apple Community