Put the camera in "P" and press the flash button above the lens release. If the flash pops, than you probably just have too much light to need it when you are in auto. The flash button is not active in auto so if the xti doesn't want the flash in auto, u can't make it fire. If the flash button does not make the flash pop in "P", search this site for another post about flash not working and u will find that this could be the flash deactivation button in the hot shoe sticking. Not likely though with a new camera unless u have had a speedlite mounted alot.--
I found the answer and fixed my flash. Look on http://photo.net/bboard/q-and-a-fetch-msg?msg_id=00ODWf
This
will describe how, if you have been using a speedlite alot, than the
little tab under the shutter release side of the hot shoe can get bent
down thus constantly pressing down (toward the bottom of the camera)
the small button which deactivates the
pop-up
flash even when the speedlite is not attached. Just bend the tab up a
little with a jewler's screwdriver, turn the camera off and on and
voila!! Fixed!!! Dan describes pushing the tab down, but on the xti,
the tab needs to be bent up to release the flash deactivation switch
and fix the problem. Thanks to Dan D on photonet for saving me a
service call.
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