oldmalky wrote:
I have a Sony a57 and also had a problem with my camera refusing to shoot, I would try everything and eventually it would work but I didnt know what i did to correct it, I found the reason when i downloaded the pics i had taken,my thumb had turned on the video and i had some fine shots of my feet,the ground and occasionally shots of the lake and sand martins.I do not know if your video button is in a daft place like mine but at least it is one reason to eliminate, hope you find your problem.
Thanks for the answer but the Canon 20D doesn't have video :( Hope your video of your feet came out well though :)