I guess you did the basic thing and see if the flash fires when pressing the shutter button.
I don't know the Rebel itself,but I can suggest a few general things. I will be speculating here for you.
Make sure that in the setup for the flash, that the curtain is in the correct mode. If I remember right there is something about when the flash will fire. Check this in the instruction manual.
Also check the flash sync speed range. If the sync speed is out of range for the flash, it will fire at the wrong time. If you want to experiment, try using 1/60 for a start just to see if it works.
If you call Canon tech support, they will help you.
Jerry G.
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