There are several possible causes for "memory card locked/protected", "memory card error", or "no memory card". The most common cause is having the tiny slide switch on the side of the card in the wrong position (but you've checked that already). The second most common is trying to use a 4GB or higher SDHC card with an older camera made before SDHC format came out. There are also other common causes if the above didn't help, with troubleshooting steps for this problem listed here. Please note that the C633 is an older camera, and can only use 2GB or less standard SD cards. 4GB or higher SDHC will not work with your camera. Fortunately 2GB cards are relatively inexpensive these days, and may be easily found on Amazon if your local store no longer carries them.
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There are several possible causes for "memory card locked/protected", "memory card error", or "no memory card". The most common cause is having the tiny slide switch on the side of the card in the wrong position (but you've checked that already). The second most common is trying to use a 4GB or higher SDHC card with an older camera made before SDHC format came out. There are also other common causes if the above didn't help, with troubleshooting steps for this problem listed here.
Please note that the C633 is an older camera, and can only use 2GB or less standard SD cards. 4GB or higher SDHC will not work with your camera. Fortunately 2GB cards are relatively inexpensive these days, and may be easily found on Amazon if your local store no longer carries them.