Nikon D3 - Manual (Page 284)

258
Q
Direct USB Connection
Connect the camera using the supplied UC-E4 USB cable.
1
Select a USB option.
Before connecting the camera to the computer, make sure the
correct option is selected for the [USB] item in the camera
setup menu (pg. 257).
2
Turn the camera off.
3
Turn the computer on.
Turn the computer on and wait for it to start up.
4
Connect the USB cable.
Connect the USB cable as shown. Do not use force or attempt
to insert the connectors at an angle.
Power switch