I've tried many things: I've changed the flash's batteries and also the camera's batteries, none of them seem the problem. I'm using a Canon t3i and sunpak digiflash 3000. I've tried the internal camera flash and the pics turned out well, but when I connect the sunpak flash and turn it on the image is dark - darker than when there is no flash on at all.
I've tried to take a picture in the mirror while the external flash is on. The flash fired off, but in the picture the flash seems to have no light at all. I'm thinking that the problem should be somewhere between the camera and flash the spot where they connect. Please help I want this problem fixed.