Nikon D300 - Manual (Page 108)

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Take the picture.
Press the shutter-release button the rest
of the way down to reset focus and
exposure and take the picture. If continuous high speed or
continuous low speed is selected for [Release mode], the
monitor will turn off while the shutter-release button is
pressed.
D
No Picture
After shooting, play the picture back in the monitor to ensure that the
photograph has been recorded. Note that the sound the mirror makes
when the shutter-release button is pressed halfway or the
B button is
pressed can be mistaken for the sound of the shutter, and that pressing
the shutter-release button all the way down when the camera is unable to
focus in single-servo AF will end live view without a photograph being
recorded.