I've owned my Canon A540 for almost two years and haven't had any problem whatsoever. But now all of the sudden I am unable to upload my photos. My laptop recognized that the camera was plugged in but that was as far as it got. I was able however to go through my external hard drive ports, but now this doesn't work.
Is it the camera, or the computer, or the software?
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There is freeware programs that can recover your fotos if you haven't tried to place any more info on the SD card. Check on the internet, and try the programs...or, if you're worried that you might not be able to recover the images, take the SD card to a reputable camera shop, or computer store that repairs laptops, desktops, etc. Certainly, someone has a program to recover your fotos.
There are several possible causes for "memory card locked", "memory card error", or "no memory card". The most common is trying to use a 4GB or higher SDHC card with an older camera made before SDHC format came out. Other causes include problems with the tiny slide switch on the side of the card, or the electrical contact switch internal to the camera. The problem may also arise from simple formatting problems if the card has never been formatted in the camera (note that this will also erase the card). Troubleshooting tips for this problem may be found at this link.
You also mention recovering photos saved on the card. If you actually did take pictures with this card (assuming it's a 2GB or less standard SD card, as 4GB SDHC was not designed for your camera), you may be able to recover the photos using recovery software. See this other link.
First you should have a program installed in your computer to transfer your pictures, best is canon's.
Once the USB cable is connected you should turn your camera on, automatictly the program detects your camera and asks you to press the transfering button. Good Luck.
Sorry for the late response (don't know how I missed this post?).
Some of The Canon Powershot A530 and A540 cameras are subject to an advisory recall. Seems that a small spring on the battery compartment door can short out the batteries. Suspect this of yours, in that you mention that your camera's battery icon is flashing. If your camera is on the list, Canon should fix this for you for free, including free shipping both ways. This is regardless of your camera's warranty status. Please check the following link for more info:
This sounds like a problem with filing system of the memory card and is indicative of forthcoming bigger problems. Try remove from the camera and slip into a memory card reader attached to a PC. You have to try and recover as much photos as you can. Thereafter, it may be required to format the memory card either via PC or the format command in the set-up/menu of the camera. Further you can use diagnostic utilities (PC side) to determine if the memory has developed any bad areas.
Hope this be of help/idea. Post back how things turns up or should you need additional information.
Good luck and kind regards.