Hey robinhood123,
The camera being in AV or TV mode should not effect the auto focus system, and if the auto focus is working in the automatic modes that implies to me the problem is with the camera body and not the lens. I would try resetting the camera to the factory default settings by following the directions on page 100 of your camera manual. If you no longer have a copy of your manual I have included a link to it below. If resetting the camera doesn't work I would have the camera looked at by an authorized service technician. I hope this helps!
http://www.usa.canon.com/consumer/controller?act=ModelInfoAct&tabact=SupportDetailTabAct&fcategoryid=215&modelid=14256#DownloadDetailAct
Sincerely,
Allan
Go Ahead. Use Us.
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