Ok when i run SfCd my screen goes black....

ok im working with gens and shining force cd,ok i have the iso file which is 57 mb's plus 34 mp3 tracks,i had them all extracted into the roms folder,when i go to use gens i change the option from .smd .bin .gen .zip over to all files,otherwise they dont show up,then when i click on the iso file (which was a Raw file before i renamed it to sfcd.iso)my screen freezes for a moment and then goes black:( this really sux i really thought this game was gonna work,so far out of 4 games i havent gotten one to work,are the odds really that great of gettin a corrupt file? or is the fault with me and my newbie skillz?