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I have the same problem with my new MacBook Pro 16-inch. It's definitely a defective GPU. Try disabling Automatic graphics switching in System Preferences to r

• _bxg1 7y ago
  If it hasn't been 14 days they have a pretty generous return-for-any-reason policy. That's the simplest way to get a new one. Otherwise, from talking to them it sounded like it was covered under warranty anyway and they offered to send it in for a free repair.