Sounds like the cable has slipped at the fixing point on the front mech, if you slacken the alan nut that clamps the cable usually 5mm on the front mech,then push your gear lever forward, take up the slack cable at the mech end and then tighten the 5mm alan nut, take care not to overtighten and strip the thread, hope this helps.
Malc.
June 2010
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