Once again, no start.

[Kevin 1G Drummer]

I went out to my car to go to work this morning, got in, turned the key to the ON position, let it sit for a second, and everything was fine. As soon as I turned it to START and the starter engaged, everything went dead. This same thing happened once before a few weeks ago, but everything came back on right away. Anyone know what might have happened? Is there a main ignition relay or fuse I should check? I looked around a little bit, but it was really dark and I couldn't really see anything.