I am playing Skyrim for PS3, and after completing a quest "Good Intentions" for the College of Winterhold, I was told about Mirrabelle Ervine could trigger the quest "Staff of Magnus". He talked about her but no quest came up, and when I spoke to her she had no option to ask about the Staff of Magnus. Is this fixable? Because I have tried reloading it, and I even started all the way back to the quest "Hitting the Books". Nothing I tried worked.
You must have the "Revealing the Unseen" and "Containment" quests completed to trigger "The Staff of Magnus".