there is. I think. Do these work? http://www.google.com/search?q=3+prong+to+4+prong+power+cord&hl=en&sa=X&rlz=1C1_____enUS406US406&prmd=s&source=univ&tbs=shop:1&tbo=u&ei=D2brTIyxKoWglAfF3_GaAQ&oi=product_result_group&ct=title&resnum=4&ved=0CEkQrQQwAw&biw=1272&bih=645