Again, thanks Mike. I should have posted that I added 4 GB and the beachballs went away. All is good now and plenty fine for my purposes of just learning MAC OS to help my wife on hers. BIAB 2017 works very well.

I've built all my own PCs - dozens - since 1983 so I could tackle such a project with ease if needed, but my local Apple dealer is a wiz and I'll probably just have him do it since this would be new to me. I won't pay more for the SSD than the whole iMac, though! By the way, you asked: it's a Mid-2011.

We can sign off this thread. I'm all set, thanks to some great help here. Appreciate it!

BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.