It sounds like the contact on the bottom is not reaching the contact in the hotshoe. First, make sure there is no renegade piece of plastic flash (flash being extra plastic around seams) on the bottom or side of the foot. Also, try turning the unit around in the shoe. Be sure the CST is fully inserted into the hotshoe, as a small mis-alignment can cause it not to work. If it still does not work, the unit may need to be replaced, as the contact may not be extended enough. Until your replacement comes in, you can use the included cord connected to your PC teminal of the camera. In this case, since the bottom is not making contact, you can leave it in the shoe and use the cord. As a general rule, however, you would not want to do this.
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