Why was it Yosef's interpretation which Pharaoh was prepared to accept despite the fact that presumably there were people in Egypt officially recognized as professionals in this field? Through a close examination of the story we can see that Yosef recognizes a crucial detail in Pharaoh's dreams which his other advisors missed, and audaciously suggests a solution to the problem that the dreams raise. 

Courtesy of the Virtual Beit Midrash, Yeshivat Har Etzion