Hey, just curious how this project turned out?!?! I'm sitting on an iMac 27-Inch "Core 2 Duo" 3.06 (Late 2009) and I'm an Apple newbie as well. This Mac wouldnt boot, after sitting stagnant for almost a year, so I took it to a local computer shop and they installed a new hard drive. It works but I can tell that it is "overwhelmed" with all the new, updated computation that Apple forces on it. Unfortunately I didnt take the effort to have a far superior SSD installed, I just told the guy to get it running at cheap cost. But, now, I just hate to toss this beautiful 27inch pristine display to the side! I have minimal dollars invested for what I have gained....so, I'm following several "iMac threads" to get a perspective on this desktop's future!
Enlighten me, did the project go as planned?
Just keep the HDD with High Sierra, and use the iMac mainly as a beautiful 27" monitor. Its value is fully reserved that way.