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Answer to: My camera is still taking pictures but the flash is not working?The first thing your going to want to check is how much battery life the Nikon D90 has maybe the camera just needs to be fully charged. A non fully charged battery can sometimes cause the flash to not work. Do to your visual inspection it is leading to assume that the light bulb for your flash has burnt out though. For more information please click here for the troubleshoot page of a Burnt Bulb.