Apple iMac 24-inch Early 2009 3.06GHz Intel Core 2 Duo (MB420LL/A) – UNICOM, Inc.
iMac 21.5-inch Late 2011 High Sierra | eBay
Amazon.com: Bootable DVD DL for Mac OS X 10.13 High Sierra Full OS Install Reinstall Recovery Upgrade
Identify your iMac model - Apple Support
Identify your iMac model - Apple Support
iMac 21.5″ Late 2009 to Mid 2011 – Apple Rescue of Denver
Identify your iMac model - Apple Support
Apple Late 2009 iMac A1311 21.5" Core 2 Duo 3.33GHz 4GB 500GB ATI 4670 Sierra | eBay
Installing MacOS Sierra on an unsupported Mac (2009 MacBook Pro 5,4) - YouTube
Apple iMac 21.5" All-in-One Desktop Computer i3 3.07GHz 4GB Ram 500GB Mac OS High Sierra w/ Keyboard & Mouse - GRADE B
Macs Able to Run macOS Sierra Remain Compatible With High Sierra - MacRumors
Late 2009 iMac - Should You Upgrade to High Sierra? | All Apple All Day
iMac (Early 2009) | Low End Mac
Reinstalling High Sierra on 2009 iMac | MacRumors Forums
The MacOS Sierra Compatibility List | OSXDaily
How to Install macOS High Sierra - iFixit Repair Guide
Apple iMac 3.06GHz Core 2 Duo 4GB DDR3 500GB HDD High Sierra NVIDIA GeForce 9400 | eBay
