Identify your iMac model - Apple Support
Can't install *any* OS on Late 2009 iMac : r/MacOS
OS X Yosemite Compatible Macs and System Requirements: EveryMac.com
What Version Of macOS Can My Mac run? | Macworld
iMac (Early 2009) | Low End Mac
macOS Big Sur compatibility: Full list of Macs - 9to5Mac
macOS - Wikipedia
Identify your iMac model - Apple Support
The MacOS Sierra Compatibility List | OSXDaily
Preparing a Mac for OS X 10.10 Yosemite
A-Tech 16GB (2x8GB) RAM for Apple MacBook Pro (Early/Late 2011), iMac (Mid 2010 27 inch 4-Core, Mid 2011 21.5/27 inch), Mac Mini (Mid 2011) | DDR3 1333MHz PC3-10600 204-Pin SODIMM Memory Upgrade Kit at Amazon.com
Identify your iMac model - Apple Support
Apple macOS Sierra: how about that compatibility list? (2022)
MacSales Compatibility Testing - El Capitan
OS X El Capitan Compatible Macs and System Requirements: EveryMac.com
What to Do if Your Mac Can't Run macOS Sierra - The Mac Security Blog
Hard Drive for iMac Late 2009-2011 ONLY 500GB, Preloaded with High Sierra 10.13 | eBay
Best Mac OS Version (Hint: macOS Sierra and higher) - MacMyths
The macOS Sierra Compatibility List
How To Install macOS Mojave On An Unsupported iMac ( Tutorial for incompatible iMacs ) - YouTube
5 Things to Know Before Upgrading Your 2009 or Later iMac
Latest macOS compatibility chart : r/MacOS
Mac OS Compatibility Guide for iMac and Imac Pro | NiwTech
iMac Intel 21.5" and 27" (Late 2009-Mid 2010) SSD Upgrade Bundle - iFixit Store
What you need to run macOS Monterey | AppleInsider
Mac model OS compatibility table | Mac Cheat Sheet
