Put new sd card in slot and camera.says no sd card detected. I've tested the card in another camera and it works.n
Are you sure it's an SD card? Even though SDHC cards will also fit into the slot, they will not work in the A540. If the card is larger than 2GB then it will not work.
SOURCE: SD Card Recognition
Perform the following procedures when your digital camera does not detect the SD card. 1. Restart the camera Turn the main power OFF, or open the battery cover or SD card/battery cover to remove the battery. Make sure the SD card is fully installed. Then, turn the main power ON, or insert a battery again and close the battery cover or SD card/battery cover until it latches. 2. Initialize the SD card Format the SD card with your camera. Formatting procedures varies depending on the camera model. See the Camera User Guide supplied with your camera for the instruction to format the SD card. When formatting the SD card, slide its tab upward to cancel write protection. It is impossible to format the SD card while it is write protected. 3. Check if your camera detects other SD cards (If you own multiple SD cards.) If your camera does not detect the SD card after performing the procedures 1 and 2, check if the camera detects other SD cards. If it does detect other SD cards, the SD card that wasn't detected may contain some problem.
SOURCE: memory card error after inserting SDHC card on powershot A620
the a 620 only goes up to 2 gb no higher
SOURCE: Canon Power Shot A400 will only work with original Canon SD card
Make sure you are using an SD card and not an SDHC card. The SDHC protocol is newer than your camera, and your camera does not support it. SD cards have capacities up to 2 GB. Your camera should work properly with any SD or MMC card.
SOURCE: How to format an SD card on a Canon SD600 camera
Could be that you have the wrong memory card.
SD600 will only work with the old SD cards, but the SD780 will take the SDHC cards.
SDHC was intended to give 4gb or more of storage, while the old SD started as 16 mb. Different cameras have different limits, but it is always best to assume that the practical limit on an SD card is 2mb. Even if the SD780 will take the SDHC cards, it can be more practical to only carry 2GB SD cards and know that they will fit either camera
SOURCE: SD card locked
The lock switch on the SD card looks like a bit of plastic without any electronics. A bit like the write-protect tab on a 3.5" FDD.
So there must be a sensor in the reader / camera which detects the position of the switch. Maybe there is dirt in the sensor. The best way to check would be to try another SD card, but you could try blowing out any possible dirt and see if that fixes the problem. Can the camera write to the SD card?
Try moving the switch to lock and unlock status.
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