Hi, when I turned on my camera all I got was a black screen. At the same time I heard a clear clunky sound. I eventually, got it to work again. Not sure if the black balance I did, or turning it off and back on again did it. Now it seems to be working, but now I have noticed a very slight noise up by the ND filter everytime I turn it on. Now, my hearing is not all that great, and I am wondering if the sound was there all along, but I just didn't notice it. What is everybody else getting?