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EOS 5D Says CF cards are not formatted


I have three CF cards and all of them worked fine till Sunday 10th September 2023, when they are in my camera it says that CF card not formatted but I have formatted them on my laptop. Can someone please help, thank you



Which specific 5D do you have (original, Mark II, III, IV)?

How old are the CF cards?  What brand?   Though since three are no longer working, that sounds like you're camera has an issue.  Depending upon its age, you may need to see about doing a repair.


EOS 5D IV, EF 50mm f/1.2L, EF 135mm f/2L, 600EX-RT (x6), ST-E3-RT
EOS C70, RF 24-70 f/2.8L IS, EF-EOS R 0.71x

I have he original, I brought these CF cards of amazon last year. Is there no way I can do it myself as I dont have a lot of money?


Did you bend a pin when inserting a card?  Look down into the card slot.

If a pin is bent, it may or may not be straightenable without breaking it off.

No pin is bent at the moment I just dont understand what is happening

Also I dont know why it put your comment as a solution lol

YOU accept a comment as a solution, or not, by clicking on "Accept as a solution". Maybe you did it accidentally. 

All the same, if multiple CF cards are not being recognized by the camera, either they all went bad together (not likely), or there's a malfunction with the camera. If all the pins in the camera are intact, what's left is the camera needs to be seen by a repair service. 

Not applicable

Have you used a flashlight and a magnifying glass to carefully examine the pins in the CF socket in your camera for either bent pins or dust and dirt in the socket? With 3 cards not working, it seems that there is a problem with the socket or electronics in the camera. If they appear to be ok, then the camera needs servicing or replacement.