I have a Canon power shot A520 , couple of years old. Just started saying "no memory card", even tho I've replaced the memory card w/ a new one and changed the batteries. When I try to reformatt the card, it won't let me choose "format" from the menu. What's up ??? thanks

• remove the memory card clean the contacts if you encounter the same problem try replacing the memory card

Canon A520 have CR1220 battery as memory backup power. Replace it. It's located at left hand side there is grey rubber cap open it, you will find one more small flap at bottom, gently pull out straight you will see a battery holder remove CR1220 battery replace same type with new one. Normally it lasts for 3 years.

hear you go try out this place http://photo.net/digital-camera-forum/00FAos

From page 145 of the A520 user manual, it appears that the largest SD memory card that this camera is able to use is a 512MB SD memory card. The manual is dated "2004", so this size limitation is not unusual for a camera of this era.
If you've purchased anything larger, there is a good chance that it won't work with this model camera.

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.

Move the slide switch on the side of the card.

Is it a new 4GB memory card? If so that might be your problem. The card would likely be an SDHC card, and your camera was designed well before the SDHC format came out. Your camera can only use standard SD cards (2GB or less).

But if the card is less than 2GB, it could have become corrupted. In this case you could try formatting the card in the camera to see if this would rejuvenate it. This will also erase the card. See this post if you wish to first recover those pictures.

Finally, if this is occurring with multiple cards, and is also saying "card locked" even though the tiny slide switch is in the unlocked position, then see this post for a possible remedy.

If you no longer have your manual, download it here; it will have all the detail you need:

http://www.usa.canon.com/consumer/controller?act=ModelInfoAct&tabact=DownloadDetailTabAct&fcategoryid=320&modelid=11125

If the other solutions didn't work for you, you can always buy a memory card reader for around $30... These plug into your computer, and then you remove the memory card from your camera, and it clicks into the reader. Or your comptuer, if it was made in the last year or 2, may have an SD card reader built in...

It sounds like your card is the problem. Try using a different card in your cam to confirm this. You might try to format the card (should be a menu that lets you do this) to see if that helps. Also check the connectors on the card and make sure they are not dirty or broken.