EOS 40D ERR 99 Shooting is not possible turn power switch to off then on again or re-install battery. I have tried this and it does not help I have taken everything off and out of camera and started over I have reformatted cf card, I have purchased a new battery I have tried different lenses nothing has worked.Hope you can help, Thanks Cheryl

SOURCE: Canon EOS 40D

go to canon site and upload the new firmware

SOURCE: Canon EOS 40D - err. 99 while taking photos

update your firmware to 1.0.3 , this will fix your problem

http://web.canon.jp/imaging/eosd/firm-e/eos50d/firmware.html

SOURCE: canon eos 40D error 99

Check this link: www.richardsnotes.org/archives/2005/04/29/50mm-lens-contact-points/

SOURCE: err 99 & err cF in my canon 350d camera

had the same problem before

found this guide online

1. Turn off the camera.
2. Remove the lens, battery, and CF card.
3. Allow the camera to sit without power for approximately 20 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 should be
serviced. If it does not, 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.

Ginko

• 19396 Answers
• Posted on Feb 13, 2009

SOURCE: Err CF then Err 99 - Canon Rebel XT / Hitachi 4GB Mircodrive

Nope, this is not card anymore.

As you know CF is card failure, sometimes this cause to start error 99 , that is lens error , even if there is no problem with the lens.

This happens because the built in software in the camera can get messed up after an error CF.

You fix the problem calling Canon, they will guide through upgrading the firmware in your camera.

First ensure that you are using the camera menu and command to format the new card, and that new cards are properly inserted into the machine.

Call Canon support to get a firmware upgrade.