Is there a problem with camera? Turned camera on to upload photos to computer will not upload? Also I went to turn camera off and it stays on? So is there anybody elsewho has this problem with the D7100? Thanks
Turn the camera off. Eject the SD card. Check to make sure the little locking tab is unlocked all the way. Put the card back in the camera. Turn the camera on. If the busy light comes on, you've probably got a bad card.
Turn the camera off and then eject the SD card again. Insert the SD card into an external card reader. If you don't have one (at least a USB 2.0 hi-speed card reader), it's a good idea to get one for much faster file transfers to your PC or Mac. If the card works (i.e., if you can see all the image files on the card and if they can all be copied from the card to your computer), the next obvious question is: did you previously format the SD card in the camera or in a card reader using your computer to do the format. The point is to always format an SD card with the camera in which the card is going to be used.
The cause of the problem could also be an SD card that is very, very slow. Older cards can't keep up with the large amounts of file data being generated by 24mp camera sensors. The cards can't store data very quickly. Sometimes the busy light stays on because the controller chip in some older cards doesn't respond correctly after a data write. The solution is to start using newer, faster SD cards, so it's a very good thing that they're so inexpensive these days.
Last but not least, is the USB cable fully seated in the camera port and in the computer port? If none of the other issues is causing the problem, an partially disconnected cable or a bad cable can often be the culprit.
The camera never really turns off, the power switch turns it to sleep mode. It does not close down until it has finished its housekeeping duties of writing the the card or other items. When the suggestion was to reset the camera I believe the posters were referring to two steps; take the battery out and leave it out overnight so it really eventually shuts off fully. Re-install the battery and do the two button reset as shown in the manual. I do not have a D7100 or manual so I do not know the page but it is in the index. That is like doing a full reboot of a desktop computer and restoring factory defaults. Just to be sure it is not the card, leave the card out when doing this step to see if it turns on and off again. If it still does not behave, than you might have a camera problem. Stan St Petersburg Russia