Does Image capture (in your applications folder) see it? does it mount to the desktop? Do you have a USB card reader?
Using one of those methods you want to get the photos off the memory card and import them into iPhoto and then reformat the card using the camera's format command
a best practice to is to never have any computer program (including iPhoto) delete the photos from the card but to import the photos and keep them and then after at least one successful backup cycle has completed and the reformat the card -- I use three very large (32 GB) cards in rotation so I do not reformat for typically a year or more giving me one more long term backup of my photos
Thank you so much for your prompt advice. The camera doesn't mount to the desktop and I didn't know what to do. But what you recommend sounds right. After Christmas I'll buy a card reader, download the images and reformat the card. The camera is new and I need time to adjust to it without panicking. Also, I found a thread which suggests that recent updates on my computer might contribute to the problem. Do you agree? And if so, how would I fix it? In any case, I'll get back to you in the new year when I've done what you suggest. I'm sure it will fix things.
Thank you again.
I'm shooting in JPEG because I have a very old version of Photoshop and I'm not sure how to use a RAW image (it's CS1). But I'll definitely install the support update, if I haven't already done so, because I want to download the trial version of Photoshop 6.
I update my iMac when prompted and I'm using iPhoto 11.
Listen, please don't let my problem interrupt your Christmas! I don't know where you are located, but in Australia it's 11pm on Christmas Eve.
Have a Happy Christmas! And thank you.