I really hate to be nitpicking, but is there something I have missed with the english language, or doesn't cpu mean central processing unit? How can you update an OS on a cpu then? Or does it mean soemthing else? I'm sorry, I just got a bit confused after reading your post.
Your are correct. I believe the term adapted in recent years so rather saying "Hey lets work on the box that holds all you pci cards, HD's and motherboard" to "My CPU needs to be fixed."