I was at the zoo taking pictures with my camera and everything was fine until suddenly the camera said it couldn't use my memory card anymore. I have a SanDisk Ultra 4GB. When I put it in my computer it said the chip needed to be formatted but I would lose all my information. How do I fix my it but keep my photos?

Try inspecting the memory card slot, eventually with a magnifying glass. Sometimes just a little bit of dust, a small paper or other debris, can block data transfer. Be sure al contacts on the card, but also in the camera are clean and shining. Never use sharp tools in or around a camera. Don't scratch the contact points.
And to make sure you can put pictures on a memory card, there must be space. If possible try to format the card in the camera. Just to make sure the camera sees the correct file system on the memory card.

When the memory card is in the camera, you see the card contents, not the internal memory. Take the card out, then delete all the photos you can find. The camera needs space on the internal memory to work, even if the memory card is empty.

The memory card may be full. Transfer the pictures from the camera as normal (or directed), and once sure they are on your computer or printed out, delete all the pictures (erase) from the memory card.

Try to take pictures again - if the error is still present (or you are unable to transfer the pictures to the computer) , there may be an issue with the card. You may not be able to use the card anymore - but before discarding, see if it works in another device or "stand alone memory card reader". If it works in either of those devices, there may be a problem with your camera. Try using another memory card to see if you get the same message when trying to take pictures with the new card installed. if you do, it looks more like a camera problem than a memory card problem. Hopefully, it's the memory - and not the camera.

Please rate this reply if helpful - good luck!

I have a Sony Cybershot DSC T70 and it keeps saying "Reinsert memory stick" whenever I turn on the camera or slide down the camera lid. Also, whenever I try to view the pictures on my laptop it shows "Please reinsert the memory stick" something along those lines. As I have been researching for the solution, I would have to format the memory card. However, I wouldn't want to lose the pictures as I just took many as from the holiday last week. The only problem is the memory card, I tried using another memory card and it works fine with the camera. There is nothing wrong with the camera.\r\nCan someone please help me how to solve the memory stick problem? It would be great. Ty.

Have you tried accessing the pictures via a card reader connected to your PC. It is possible the card is damaged and you will not be able to recover your pics. But it is worth a try. If you do not have a card reader take the card to a camera shop and see if they can see and manipulate the pics to another card, then reformat the card and reinsert it to see if it then reads anmd writes.

Goto any radio shack and get a external memory card reader this will allow you to get your pictures if the camera or cable is defective.

i would save your pictures on to a disc, then re-format the card.

This is a known issue.  Check out the Canon Support site: http://www.usa.canon.com/consumer/controller?act=PgComSmModDisplayAct&fcategoryid=223&modelid=8777&keycode=2112&id=27465

Check your pics on the computer. Are they still dark? If they're OK then problems in camera's display.

I have the same camera and the same problem. Can't use SD cards anymore, only the obsolete Multimedia Cards that are extremedly hard to find on shops because SD cards are the substitute for them... hope you can find a Multimedia Card. At least mine works fine with them.