SOURCE: how to unclokc canon sd700 power shot memory card
Move the slide switch on the side of the card.
Testimonial: "it was very helpful i been trying to unlock it for week never new there be tiny button on card THANK YOU"
SOURCE: Canon Power Shot A480 memory card error showing on
If it's a brand new card, it needs to be formatted with the camera. If it's been used before, the files may have been corrupted when plugged into your (or another) computer.
SOURCE: when i insert 4gb memory card into canon power
Your new 4GB memory card is the problem. The card would likely be an SDHC card (look on its front cover). Your A540 camera was designed well before the SDHC format came out, and your camera will not recognize it. Your camera can only use standard SD cards (2GB or less). Here's some from Amazon.
SOURCE: Can i use a 4Gb memory card in a Canon Power shot
No. The A430 is designed to work with SD cards 2GB and smaller. It will not work with the larger SDHC cards.
SOURCE: I have a Canon Power
The A520 is designed to work with SD cards. Your 4GB card is actually an SDHC card. While it fits into the slot, it is electronically incompatible.
You need to use SD cards 2GB and smaller.
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