Hi, I have a Canon Power Shot S2 IS 5.0 megapixels that was working fine until one day I changed the memory card from 512MB to a 1GB. Now every time I turn the camera on and try to take a picture, a beeping sound and a legend on the LCD screen that reads: Memory card error. It's like something locked the shutter mechanism. I tried other memory cards with the same results. Thanks, Roger.

Its possible that there may be an error on the camera try to reset the camera by

1. Turn the mode lever to the camera or play button
2. Press and hold the MENU button for more than 5 seconds.
3, The message "reset settings to default?" appears
4. Use teh arrow buttons to selelct ok. then press the SET button.
5. It should then reset the camera.
AFter doing that and the problem is still there. Format the memory card using the camera.

I hope this has answered your question sufficiently. If you have more questions please post a reply and i would be happy to assist. Thanks.