How do I prevent hackers from gaining access to accounts and identity on my new iMac?
Recent hacking on my new iMac--hackers gained access to accounts and identity. How to prevent?
[Re-Titled by Moderator]
Your Mac was not hacked.
Your online accounts may have been, but your Mac was not.
See this article if you believe your Apple account was compromised:
If you think your Apple Account has been compromised - Apple Support