Yeah, you take it back in and they fix it. Or you fix it yourself. Just like any other computer. If your issue is something hardware related, Apple will still fix it, it just costs a lot because you’re paying for it in every part of the engineering. You can also go to third party repair shops and have them fix it for cheaper.

I gave a friend a powermac g5 that I had gotten for free as a teen, gave it to them 10 years ago, and it still works too, it’s just slow. That means nothing.