How to Perform a Clean Installation of macOS Sierra - MacRumors
Apple iMac 21.5″ Mid 2010 Core i3 3.2GHz 8GB 500GB DVD-RW WiFi macOS 10.13 High Sierra – Refresh Computers Online Marketplace
macOS Sierra Compatible Macs and System Requirements: EveryMac.com
PSA: macOS Sierra drops support for many Macs from 2007, 2008, and 2009 | Ars Technica
How to Prepare Your Mac for macOS High Sierra - The Mac Security Blog
How to Install macOS High Sierra on an Unsupported Mac - YouTube
macOS 10.12 Sierra review | TechRadar
macOS High Sierra: The new features and updates that matter most | Macworld
MacOS High Sierra Compatible Macs List | OSXDaily
Hard Drive for iMac Late 2009-2011 ONLY 500GB, Preloaded with High Sierra 10.13 | eBay
MacOS High Sierra Compatible Macs List | OSXDaily
macOS Sierra Download Released, Get it Now | OSXDaily
Apple iMac 27″ Mid 2010 Core i5 2.8GHz 8GB 1TB DVDCDRW Wifi macOS 10.13 High Sierra – Refresh Computers Online Marketplace
SOLD- Mid 2010 - iMac 27” - $695 | Denver Mac Repair
What to Do if Your Mac Can't Run macOS Sierra - The Mac Security Blog
Apple - iMac (21.5-inch, Mid 2011) i5, 8GB, 256GBSSD, High Sierra- Ref – Ordinateur St Joseph
macOS High Sierra - Wikipedia
Apple 2010 2011 iMac 1TB Hard Drive MacOS 10.13 High Sierra 7200 RPM | eBay
macOS High Sierra review: A radical new foundation for your Mac | iMore
macOS Sierra | Low End Mac
iMac 27" 2.93GHz (Mid 2010) | mac of all trades
macOS High Sierra vs macOS Sierra: Should you upgrade to High Sierra? | Macworld
macOS Sierra - Technical Specifications
Download macOS Sierra | MacUpdate
