Canon SD850 IS showing "unidentified image" after pic is taken

There are really only two possibilities. Either the card is at fault, as you believe, or the camera is not encoding images correctly.

Since the image encoding is coded into the camera when it's manufactured, and it's worked fine until now, there is really no reason to believe that's the problem. Unless you've done some kind of upgrade to the camera's internal software (which I seriously doubt), there is nothing that would cause it to improperly encode images.

So, yes, it's the SDHC card. Do you still have the 32 Meg card? Try using it and see if the problem continues. Also, how big is the SDHC card? The SD850 is only rated to use up to a 4 GB card. That doesn't necessarily mean that larger cards won't work, but they're not guaranteed to work. If your card is larger than 4 GB, you might want to try a 4 GB card and see if it works better.

Alternatively, you could have just gotten a bad card. That does happen from time to time. Either way, I would try to return the card to the store you bought it from. Either it doesn't work, or it doesn't work for you.

-Dyllan

There’s nothing inherently wrong with your notebook, and nothing you can readily repair; most notebooks’ video cards and their drivers aren’t equipped to display video through a projector and on your notebook at the same time. You could try updating your video drivers, but you will likely have to change your system’s primary video source to the projector. Solution:
Different PCs may require slightly different steps, but opening Display Properties in Windows XP should generally be your starting point. Click Start and Control Panel and double-click Display. In the Display Properties dialog box, click the Settings tab. At this point, you should consult your notebook’s users manual to configure your notebook to use the projector as your primary video source.