This morning after changing my cf card the camera kept giving me err-2. Narrowed it down to the cf card. Coming from a computer background really helped me out in this case. When you put in a cpu, there are pins very similar to where the cf card slides into on the camera, and if you don't line them up just right, you can bend or even break them. I couldn't see that far down without going outside right in the sunlight. Sure enough, one of the pins had somehow gotten laid over on another one. Went by the local camera shop but they were closed. So, I decided to find something that was thin, flat and just the right size to get down in there and bend it back. Finally used a tiny screwdriver like what you use to work on computers. Bent it back enough to slide in the card, and voi la! Works like a champ. Never would have even though of this had I not worked on computers, which is basically what a digital camera is at its core.