hmm... would you mind posting some code?
everything should work about the same as in windowed mode. are you sure you are drawing the image inside the screen (the x and y are inside the screen's bounds)?
sounds stupid, but just thought i would make sure =D. only thing I could thing of that would cause the graphics to not render correctly. Are you drawing something over the image, so that the image does not show up on your screen?
Or, have you checked drawing the image in windowed mode? Are you sure the image is not null?
Anyway, the easiest way for me to help you would be to post an excerpt of your drawing code. Hope that helps...
Alex