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I tried running high sierra but it wouldn’t install so i assume that os is to advanced for it, which was the original os for this imac?
Here’s how to do it: Requirements: • Early-2008 or newer Mac Pro, iMac, or MacBook Pro: • MacPro3,1 • MacPro4,1 • iMac8,1 • iMac9,1 • iMac10,x • iMac11,x (systems with AMD Radeon HD 5xxx and 6xxx series GPUs will be almost unusable when running Mojave. More details are located in the Known Issues section below.) • iMac12,x (systems with AMD Radeon HD 5xxx and 6xxx series GPUs will be almost unusable when running Mojave. More details are located in the Known Issues section below.) • MacBookPro4,1 • MacBookPro5,x • MacBookPro6,x • MacBookPro7,1 • MacBookPro8,x How to install macOS Mojave on Unsupported Macs
OS-X El Capitan 10.11.x is the highest it can go, sorry ;-{ Your systems specs: 20” iMac 2.26 GHz Core 2 Duo (Mid-2009)
