Mari, you don't need to start the game again--you are not supposed to have that blue medallion after you've opened Jacques' locker. Set your alarm for 3am, and go down to Professor Hotchkiss's room (I think you may meet her in the hall leaving her room, but I'm not sure about that). You are several things for you to do in that room:
<span class="spoiler_containter"><span class="spoiler_wording">Click Here For A Spoiler</span><span class="spoiler_text">check out her briefcase and look under and behind the cushions on the couch--you'll find the blue medallion and this time you get to keep it...</span></span>
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"Once you give up integrity, the rest is easy." Anonymous