Ransomware - you should have not touched anything, mouse, keyboard, buttons or anything and simply powered off. It's clicking anything that activates these things. Did it encrypt any of your personal files?
Can you reboot into the MAC equivalent of Safe Mode and restore the system to an earlier date? Not sure how that works as I have no MAC experience, but I gather they have a similar function to Windows System Restore.
There may be some hints in the last link below, but as I said, for MAC's things aren't the same. Hopefully something there can help.
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BTW cleaned means McAfee detected something and deleted it. However I doubt it cleaned the ransomware, if it did take root.