This study investigated effects of distraction in problem solving situations. University undergraduates ( N =258) were instructed to remember their recent experience of being depressed about academic achievement, and then they completed a questionnaire which measured their concentration on distraction, positive mood, problem solving behavior, negative rumination, and knowledge of effective activity. The results of path analysis indicated that concentration on distraction enhanced problem solving by facilitating positive mood. Knowledge of effective activity enhanced problem solving, while negative rumination impaired problem solving because it negatively affected concentration on distraction.