How to fix a CF Card problem?

The card could be bad. However, I have found that some card readers
will fuck up the card (pardon my French ;-) ) if you delete any images
off the card. Try formatting it in the camera or a "full" not quick FAT
or FAT32 format on your computer. See if it works. If that doesn't work,
run a disk checking or file recovery program on it. See what it reports.

Stef

Since you can get a new 1gb card for about $15 or a 2gb for about $25, I
wonder if it would be worth the hassle.

I had a 1 GB Kingston Pro Elite go bad on me. I was pleased to find
they have a lifetime warranty, which was honored without hassle. Maybe
your brand is the same.

It's probably busted. Get a new one. One last ditch effort: try to
completely low level format it on the computer, then put it in the camera
and try a format.

You (and we) don't know enough yet to tell what's causing the
problem. First inspect the card's sockets carefully to make sure
one of the tiny holes hasn't been clogged with anything that might
have bent a pin in both your camera and card reader. With any luck
that won't be the cause of your problem. If there are no bent pins
then you may simply have a card that has died. Flash cards are
pretty reliable and failures are rare but it occasionally happens.
To test further you should try to get another CF card and test that
one. Many new cameras included in their boxes a too small, almost
useless memory card, often 4MB to 16MB in size. That would be an
ideal card to use to check out your camera. If you don't have such
a card, either because it has been lost or because the camera didn't
include a card (some cameras don't supply a card because they have a
small amount of permanent memory built into the camera), buy or
borrow a card and use that one - but only if you've first determined
that the camera has no bent pins. If it has any it may be best to
consider replacing the camera with one a new one if your camera
isn't still covered by a warranty, as repair costs are usually too
high to be cost effective. A new camera is *very* unlikely to use
CF cards, and whatever type they use (SD, SDHC, xD, MemoryStick,
etc.) it won't have the more problematic pins that CF cards use.