Camera says no memory card when one is in.

What type and size memory card? The S2 works with SD cards, 2GB or smaller. It will not work with higher-capacity SDHC cards.

Try to retrieve the files from the memory into your computer, if you can't see the pictures after they are moved, they might have been corrupted while you were using the camera.
In theory, you might have placed the camera near a strong magnetic field, like a speaker. This could explain the files being corrupted if that's the problem you have.

Things to check first for a camera that won't turn on are battery contact points, and micro switches that are located on the battery and memory card doors. Troubleshooting tips on other things that need to be checked may be seen here. These tips won't work for every case, but they're worth a try.

The internal memory only works when no card is in the camera and then only holds a small number of pics. If you had the memory card in the camera most of the time, most of your pics were on the card.

You could use a separate card reader to download your pics. Then, format the card in the camera.

Use a card reader to download your pics.

Hi

There is a very small metal contact inside the memory card slot that is pressed when the card is inserted all the way. If this is damaged the camera will 'think' there is no memory card and will not work.

You can replace the board (PCB) and that will solve the problem, or if you know somebody who is really handy they can open it up and probably bend it so that it always thinks there is a card installed even when there is not.

We can repair it for you by replacing the PCB, we are an affordable digital camera repair business, let us know if we can help.

Thomas D.
Owner- Darntoothysam com

try fomat the SD card before you take pictures

SD cards have a slide switch along one edge. The position farthest from the contacts locks the card, protecting it from writes. The position nearest the contacts unlocks the card. If the switch is already in the proper position, slide it fully the other way and then back again.

If that doesn't work, try another card.

Here are some simple things to try first for a camera that won't power on. They won't work for every case, but they're worth a try:
http://camerarepair.blogspot.com/2007/11/simple-fix-for-dead-cameras-that-wont.html