1.Remove the battery, lens and CF card. Allow the camera to sit without power for 20 minutes and then reinsert a fully charged battery.
2.Turn the camera on and push the shutter button as if you were taking a picture.
3. If you don't get the error message reattach the lens and insert the CF card.
4. Check the below canon eos 20d service manual link:
http://goo.gl/YtVLQR
it will help you to save a lot of money
Hope it helps, Thanks
SOURCE: Canon EOS 20D shutter error
Hello - I figured it out. I had the exact same problem. The shutter failed and it had to be fixed by Canon. Apparently that happens after the shutter fires so many times (like a click-count on a printer). I just got my camera back and it's doing awesome now.
SOURCE: error 99 on EOS Canon 450D
This is what the people at the canon tech support say to do for error 99
read this!! :)
The guy at tech support listened and then told me that the lens contacts were dirty and to get a pencil with an eraser on the end, just a regular old pencil with a red rubber eraser. Detach the lens from the camera, hold it so that the lens’ gold contacts are pointing down and lightly erase their exposed surface, cleaning them of any hand oil that might have gotten on them.
Do the same thing with the gold contacts inside the camera body. This is a bit harder but it’s doable: just hold camera so lens opening points down so no gunk falls in. Erase lightly. I used a lens cloth and dabbed at the contacts rather than blow them so as not to blow the erasings inside the camera.
I did this to each of my three lenses just to be sure. Lo and behold, it worked
hope this works for you!!!! have a nice day!! :) :)
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