Just FYI, I ran into something wierd with my mom's digital camera. Can't remember now what model but it was a tiny red quick shot type camera.
Anyway, I was curious why it didn't appear to connect (it actually did), there was no HD icon, no notification that it connect except on the camera screen (it gave some message like USB Connection) but nothing on the Mac.
After about an hour of trying to figure it out and my sister saying she was able to download them on her MB, I opened iPhoto and blam, sure as ***** there was the camera. That's when my sister said "Oh yah, I had to open iPhoto to get the photos out." She ended up with a bruised arm and I finally got the pictures off 😀
Basically what I'm saying is see if that works. The desktop showed no camera connection, iPhoto didn't pop up (and I have mine set to do so) but when I did crank up iPhoto, the camera showed up. Kinda like my iPhone, nothing shows up that it's connected until I open iTunes (I might have that set wrong but doesn't matter to me)