Have a canon rebel EOS 20D that registers an error 99 after I take one frame and then won't allow another one to be taken until I turn camera on then off again. Does this require factory repair or is there something I can do.

Hi LLFraserny,
You can probably try to isolate the error 99 first.
To isolate the cause of the issue, do the following:
1. Turn off the camera.
2. Remove the lens, battery, and CF card.
3. Allow the camera to sit without power for approximately 30 minutes.
4. Insert a fully charged battery, and turn on the camera.
5. Depress the shutter button as you would to take a picture.
Does the “ERR 99′ message appear? If it does, then the camera will need to be serviced. If the message does not appear, then please proceed to the next set of steps:
1. Turn off the camera.
2. Insert the CF card.
3. Turn on the camera.
4. Format the CF card in the camera.
5. Depress the shutter button as you would to take a picture.
Does the “ERR 99′ message appear? If so, then the CF card is the most likely source of the issue. Try using a different card.
If the message does not appear, please complete the following steps:
1. Turn off the camera.
2. Clean the lens contacts by gently rubbing them with a pencil eraser or soft cloth. Be careful that you do not let any debris fall into the camera body.
3. Reattach your lens.
4. Turn on the camera.
5. Depress the shutter button as you would to take a picture.
If the “ERR 99′ message only appears when one particular lens is
attached, then that lens should be examined by a service technician.
If you see the “ERR 99′ with a different Canon lens attached, then the camera should be serviced.
One last item to check before sending camera to Canon service is the alignment of the shutter. Life the mirror and visually inspect the shutter curtain. If each segment is not completely straight, touch it lightly with your blower bristles and try to pop it back into alignment.

Hope this helps,
Andrew