When I start up the camera it will start shooting pictures rapid fire until I touch the shutter. Once I tap the shutter this stops, however, the focus won't work as everytime you tap the shutter the camera fires another picture. While it is doing this the number of pictures still on the memory card is flashing. The menu isn't avaliable during this either. If I change the shooting mode the menu is avaliable until I tap the shutter again. Then nothing will functhing appropriately.
Every now and then it will go into a mode where it won't shoot a picture. Even if you put your lens in manual mode it won't shoot a picture.
I have tried to change batteries, memory cards, and lenses with no luck.
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3) Canon had a run of bad motors for this model - if mirror does not go up, then it is the mirror motor. If mirror goes up, shutter will not fire, press release again then the mirror goes down, the shutter motor is bad (same model motor). If mirror goes up, shutter fires, both blades travel together/no exposure, probably the shutter is bad.
There are over 40 different malfunctions that can cause an error 99 on a Canon 40D. The 2 that account for over 95% of the error 99's are either a bad shutter mechanism or a bad mirror driving motor. It takes special diagnostic software to determine the exact cause. Otherwise, a repairer just has to start replacing parts until the problem goes away. Bob Kilbourn www.camerarepairs.com