Pls Help…My Seagate FreeAgent Go couldnt be detected anymore

can anyone help me with this problem?my Seagate FreeAgent Go 320GB External HardDrive could not be detected anymore and the led light also didnt blink anymore..but when i plug it to my laptop it blink once but same issue it didnt detect or function my Desktop and Laptop are Running Windows 7 Ultimate…could anyone help me with this…pls..thank you & God Bless