It's ME! I had a speck on my sensor. The blower could not get it. I thought I would put on a long exposure and knock it with a Q Tip. WROOOOONG! I was too slow and the shutter closed down. Now the camera is broken and I have to get it proffesionaly repaired. Apparently there are some delicate parts on the shutter for speed and precision that break very easily. Also it puts the camera out of sync and the mirror stays up. Woe is me.