Why is my camera taking black photos

I was doing a shoot about 5 months ago at a motor-cross raceway, and after about 200 or so shots, I finally got a chance to start reviewing some of my shots - I wanted to make sure of focusing, and to my horror, picture after picture after picture was completely black. The first thing I checked of course was my settings, and they were all fine. I don't know if you have ever felt anything like that but I was absolutely sick to my stomach LOL.. Well, I said all that to say this...

I actually ran to my car, sat down and paused a few seconds, I then looked down at my camera, and suddenly thought for a second to take the lens off - so I did, and after removing the lense, I noticed that the mirror was up, and the shutter was closed - the shutter was stuck closed. I tried everything to un-stick it, except stick something inside the camera body, and I WAS NOT about to do that, so what I decided to do was to simply turn off the camera, and pull the battery hoping that it might do a reset on the mirror, and you know what IT WORKED!!.

1. Turn your camera off

2. Pull the battery out of the camera

3. Replace the battery

4. Turn the camera back on.

I hope this will help you, but that is what was wrong with mine, and I haven't had the issue repeat, so hopefully it was just one of those things.