Nikon D800 - Manual (Page 267)

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Q
Direct USB Connection
Connect the camera using the supplied UC-E14 USB cable.
1
Turn the camera off.
2
Turn the computer on.
Turn the computer on and wait for it to start up.
3
Connect the USB cable.
Connect the USB cable as shown.
4
Turn the camera on.
D
USB Hubs
Connect the camera directly to the computer; do not connect the
cable via a USB hub or keyboard.
D
The USB Cable Clip
To prevent cable from being disconnected, attach the clip as
shown.