40D dead :(

How long is the warranty / when did you buy it?

Might be worth sending an email or letter to canon to see if they will do it for free, always worth a try.
 
I think you can update the firmware with the camera wired to the PC (have done mine before, and have only recently got a card reader).

It sounds like a problem with communication between the camera and card - might be worth checking to make sure none of the pins in the CF slot are bent, although I wouldn't fancy trying to fix them if they were :(
 
And now you know why I detest CF cards

Puts me off ever buying a camera that takes the damn things
 
And now you know why I detest CF cards

Puts me off ever buying a camera that takes the damn things

Why?
I doubt if this is a CF card issue.
SD on the other hand is slower, and has less structural rigidity, they are simply too small to be strong enough to protect the PCB and chips inside (try flexing one!).
 
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