MacBook Retina 12 inch, started to be sold last week via the online Apple Store. When a user opens a MacBook box for the first time, initial setup is required, which includes language selection, creation of a local account, sign in to iCloud, etc. All the steps are very simple. However, some users faced the problem where a MacBook stops responding, in which case they were not able to continue the initial setup. Apple is aware of the problem, and even if they didn’t mention why the issue occurs, they gave the advices through the document they’ve posted on their website.
In case you have this problem, Apple suggests two things: “Allow Setup Assistant to complete” or “Restart your Mac during setup”. This is the complete Apple explanation related to the issue above.
If your MacBook stops responding and if it shows a spinning wheel after you created the user account in Setup Assistant, simply allow the setup to continue. The setup process will resume after about 30 minutes.
You can avoid this delay if you complete Setup Assistant without connecting to the Internet. When Setup Assistant prompts you to select your Wi-Fi network, click Continue without selecting the network. If you have an Ethernet adapter, disconnect it before you start the setup process. After you complete the Setup Assistant, restart your Mac. Now you can join your Wi-Fi network or connect your Ethernet adaptor, as well as set up iCloud.
If you restart your Mac during the setup, the Setup Assistant will appear again. If you continue the setup and see a message that the user account you’re trying to create already exists, create a temporary user account to finish the setup.
From my own experience, I can tell you this issue occurs not only on MacBook Retina 12 inch. It can also occur or MacBook Pro Retina 13 or 15 inch. The advices Apple shared make sense, so if you had the same problem, listen to these advices, and the setup will be finished successfully.