Other than a broken camera, there are 2 possibilities with the old card:
1.) Old card is now dead, or
2.) Old card is OK, but was reformatted to the other camera, and you need to reformat it in this SX20IS.
I would test the old card as follows:
1.) Is old card now dead? Try it in your other camera and see if it works there.
2.) Old card was formatted for new camera and needs to be reformatted by the old camera? Try reformatting it in the old camera.
As for the new card:
It could be that as Cicopo says it is too new to work in the old camera. I would nevertheless try reformatting the new card in your old camera just to be sure.
As for the camera:
It could just be dead, but if it was working fine last time you tried it, and it has not been dropped, nor stored in a hot storage unit or something, it seems odd for it to have died while not even being used.
Scott
Canon 5d mk 4, Canon 6D, EF 70-200mm L f/2.8 IS mk2; EF 16-35 f/2.8 L mk. III; Sigma 35mm f/1.4 "Art" EF 100mm f/2.8L Macro; EF 85mm f/1.8; EF 1.4x extender mk. 3; EF 24-105 f/4 L; EF-S 17-55mm f/2.8 IS; 3x Phottix Mitros+ speedlites
Why do so many people say "FER-tographer"? Do they take "fertographs"?
