Sat 16-Mar-13 09:46 PM | edited Sat 16-Mar-13 10:32 PM by stappy
I would have guessed the CF card but since you've already tried another, get a flash light and look into the slot for a bent pin. You might also try leaving the camera overnight without a card installed. I would assume your battery would be fine the next morning but it is worth having that test point. If there are no obviuos bent pins then I might get a brand new low speed cheapo card and give that a try because the next step is probably a trip to the shop.
Edit: I missed that the other card you tried was new so the last comment is probably not necessary.