you need the patch to be the same region as on your disk , so eg. Mine is bles683 if your in the US it will be blus *** whatever if you try and put a bles patch on a blus disk you will get black screen
Black screens can mean a number of things
if you have a uk disc, make sure you download a uk patch_mp.ff to inject your gsc's into (if you're using elitemossys converter)