Cameras have to be in the off position when installing or removing the SD card. As long as the following are okay, the camera should work unless it either has a fault or needs a software up grade if one is available. 1)good batteries, 2)unlocked card, 3)formatted card, 4)proper size card: this one you have corrected. If you still have problems, I would suggest emailing Cuddeback. Other forum members or other forums may have some suggestions as well. Good luck.