A lawyer accused of conversion should get a new disciplinary hearing because the first panel to hear the case violated a rule by considering written closing summations using PowerPoint slides. That’s the recommendation — a rare one — from an Attorney Registration & Disciplinary Commission Review Board panel in the case of Donald P. Rosen, 60, of Carpentersville. “The factors involved in this case seem to have no precedent,” said ARDC Deputy Administrator James J. Grogan. In May …