i had a ceiling fan installed,but didnt have the light installed at that time. now i want to connect the light. i connected the wiring to the socket (from the fan there was a white and a black/white wire; from the light fixture there was a white and a black wire. i attached the white to the white, then the black/white to the black wire) but the light doesnt work. do i have to do some wiring in the attic to get this to work.