Date of Logic Board

Thanks, I’ve done that and it tells me it’s an early 2015 model, which I knew. But isn’t that serial number just the original number as shipped by Apple? ie does it tell me whether in fact the logic board got replaced at some point?

@prouss - All 2015 13" MacBook Air models where made within a production window between March 2015 to October 2016. Beyond that there is no way of digging deeper. And frankly it doesn't matter from an OS perspective as your system can support Monterey (any 2015 MacBook Air can!)

OK, so there was no logic board switch-a-roo done on you that prevents you from running Monterey. So we need to look deeper on what is the root issue!

I would start off running the onboard diagnostics to make sure their isn't a problem with the hardware and given the systems age I would also investigate if the battery is still good.

So to check your system restart it and press the D key to enter the diagnostics to check the battery install this gem of an app! CoconutBattery take a snapshot of the apps main window and post it here for us to see Adding images to an existing question

And let us know if you got any errors running diagnostics.

Thanks, the diagnostics showed no problem and coconut said battery health was good.

@prouss - Can you please post a snapshot of CoconutBattery so I can see it.

Interesting. I thought the coconut screenshot said status was good. But I'll look into replacing it. And you think that's why I couldn't install Monterey? And do you think that would also explain why I get a lot of spinning beachballs?

Thanks