Pictures captured by my camera are not complete

your cmos sensor might be dead. try taking it into canon for repair.

this happened to me as well. the mirror on the shutter is attached with a plastic pin. pin breaks: and mirror obscures part of the image area.

i had my camera repaired for $175.

Hi there
The blacked out part is the bottom of the photo therefore the obstruction is at the top of the frame on the camera.
Try the camera on the BULB setting without a lens on & look into the throat of the camera. You should see what is not clearing the CCD completely.
It could be the sub-mirror which is a little mirror behind the main one for the AF function or a shutter blade not clearing enough.
I would go for the first one.
It could be because.....
1. the sub-mirror spring coming off or broken
2. the sub-mirror is glided by a post on the side of the mirrorbox & this could of come adrift.

Most repairers can deal with this fault. If the spring has come adrift you should be able to pop it back in place.
All this may not solve your problem but it will at least give you better idea of what you are dealing with.

Are you using an external flash? It might be working it's way loose. While shooting a wedding, i will occasionally check the flash to make sure i have not wiggled it loose with all the movement. This often happens to me with high use.

When this happened with my film camera the speed on the camera was not set on the sync # that would sync up with my external flash(example: 1/60 sec). I don't know what your settings were when you used the digital camera, but look into the flash sync speed.