Duane, I believe YN565EX has an optical
slave mode, try to fire it with your pop up
flash. Often times you have to do this with M
mode on the camera to avoid premature firing
of optical slave because of ETTL pre flash.
Post your results. Even this works you could
have other issues. To fire a flash you need
connectivity between center and earth while
rest of the pins are communicating other data.