Error 99 is my problem... any ideas on a fix?

This may help you, it is from Canon.


Thank you for contacting Canon product support. I'm sorry to hear that
your EOS is displaying an "ERR 99" message.

To isolate the cause of the issue, we suggest that you 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 20 minutes.
4. Insert a fully charged battery, and turn on the camera.

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.

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.

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.

For factory service, forward your digital camera (remove the CF card
and battery) properly packaged and insured, with a letter describing the
difficulties. Be sure to include your name, address, telephone number,
and proof of warranty (if applicable). Send to the Canon Factory
Service Center at the following address:

Canon Factory Service Center
100 Jamesburg Road
Jamesburg, NJ 08831
Tel.# (732)521-7007

or

Canon Factory Service Center
15955 Alton Parkway
Irvine, CA 92618
Tel.# (949) 753-4200

Your equipment will be examined and you will be advised of the
findings.
The length of time for the repair will be dependent upon the nature of
the repair and availability of parts if needed. If the repair entails
something that is not covered in warranty you will be sent a written
estimate to the address that you have provided.

Thank you for choosing Canon.

Sincerely,

xxxx
Product Support Representative