question about conair extremesteam professional handheld garment steamer

I bought the conair extreme steam professional garment steamer and it worked beautifully, once. the second time the water flow seemed to be blocked and the steam dif not come out. i shook it and somehow dislodged a water bubble and it worked, but now it does not work again. the water does not flow into the device from the chamber. I've carefully put the parts together and cannot figure out why it doesn't work. the light comes on as if it is ready. I can bring it back but i like it's compact size and the way it worked once. any advice?