At this stage I would do a factory reset and then try it out. If that is not enough, turn it off, remove the battery, card and lens and let it sit for a day or so to go into deep discharge. Then put them all back in again and fire it up. After that, if it does not work, I suggest calling 800-OK-CANON if you live in the US to have a talk with a friendly Canon tech.
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
