It was working fine, then suddenly it won't read a CF card. I get a message saying Card not formatted. I've tried a new card. Reformatted the new and the old card.
The camera is not reformatting the old or the new.? A new card should format just fine in camera, the most likely issue is the old card finally died. But if a brand new card is not working either that is more concerning for sure. If a new car wont read, there may be damage to the pins in camera, you could factory reset the camera to make sure to remove any possible bug in the system, but you cant really reach, fix, or clean those card reader pins if the issue is the hardware.
A bent pin in the card socket is the most likely cause. This usually happens because a CF card has been used in a cheap card reader which has mis-aligned pins, this damages the CF card then the CF card ends up bending pins in the camera. The pins in the camera can sometimes be realigned if the damage isn't too great but this does take very careful manipulation othewise the pins can break off. I would advise that your card reader should be replaced with one of reputable make and the original CF card should be scrapped and not used in anything else.
Yup. I got a magnifying glass app, and it's a bent pin. The camera cost me nothing so I'll have a go at straightening it. Thanks.
Even after reformatting, the card might still be corrupted. Try using a different card reader or computer to see if it can read the card. Try using a card reader to scan the card for errors. If it finds any, try repairing them. If the above doesn't work, it might be a hardware issue with the camera itself. Consider taking it to a professional repair service.
Did you even read the history? He already found he had a bent pin in the camera. Its like you responded to 1st post without reading any of the other messages ...