I am using a canon rebel XT and when using just the on board flash nothing happens. When i press the flash button (in any of the P,Av,Tv or M modes) the flash does not pop up but i do not get the regular falsh error message. Usually the XT gets error05 on the back LCD but in this case nothing happens. I have reset the camera back to factory setting and still nothing happens. Is this a "send it to canon" problem or am i just missing something?