Memory card error

SOURCE: memory card error

Usually, this means you need to format the card in the camera before using. This completely erases the card and optimizes it for the camera.

SOURCE: Memory Card Error-Won't take Pictures

Hi momincali - I posted a solution for someone that seemed to have the same problem as you. If you didn't see it, this is what I wrote:

I had the same problem on my PowerShot S400 as well as I couldn't reformat the compact flash when using the feature on the camera. The solution that worked for me was reseating a small battery (about the size of a watch battery) in side the camera. To get to it you have to take the case apart.
I found this solution by googling and typing:
powershot S400 E50 error
I'm not sure if this site will allow me to add the web link - but this link had a picture of the camera and where the battery is located.
http://www.pinoyhack.com/2006/09/14/canon-powershot-s400-fix/

I decided to try it, since I figured I had nothing to loose, becaues otherwise I'd be looking for buying a new camera. To my surprise it fixed my problem, but I do not know if this is a permanent fix. If you do try this - take note of where each of the screws come from. There were 4 different size screws around the case.

There seem to be a lot of complaints about this problem though.

Good luck.

SOURCE: Camera display shows "memory card error".

I would give this software a try:
http://www.download.com/VirtualLab-Data-Recovery/3000-2248_4-10610841.html?cdlPid=10801131
and be more vigilant about backing up your pictures. Flash memory can corrupt at any time. Good Luck.

SOURCE: when you take a picture, camera shows memory card error

These cameras are on the list of the ccd problems.
Here is a link to the site you may need. Canon will repair it for free if it is the ccd problem. Note that they will pay for shipping both ways as well if it is the ccd problem. Call them on the toll free number.
Canon Repair Service Center