I have a Nikon D5100 and i was taking some photos and videos outside. so like any other person, i put in the sd card into the slot, but it doesn't recongnize the sd card! this is really annoying me. also, the camera-to-computer usb isn't working either! it was just working last week so what's the problem?
1. Does it show up in Disk Utility?
If so, do you have Finder's preferences set to show external disks on the desktop?