Hi Niki and welcome to the forum:
Right off, when something like that sparks and makes a bang that is a fairly definitive sign that it has suffered a catastrophic failure - a bang or sparks usually suggest a short or power surge, neither of which is good for the camera as a whole.
I would first of all suggest you try to shoot without the flash and see if the other functions of the camera work. If not, it is likely the whole motherboard is cooked and that is expensive. If it does work in available light, then I suggest you call 1-800-OK-CANON and have a chat to their friendly service people. However, assuming it is not under warranty, it is likely to be more than the camera is worth to repair, in which case you could try the Canon upgrade program, where they give you a credit off the cost of a new camera.
cheers, TREVOR
The mark of good photographer is less what they hold in their hand, it's more what they hold in their head;
"All the variety, all the charm, all the beauty of life is made up of light and shadow", Leo Tolstoy;
"Skill in photography is acquired by practice and not by purchase" Percy W. Harris
