Yes it has a security system. The entire startup process was normal except when I went to hit the start button... lights came on, run switch was fine, etc. I did not remove the main fuse at any point which makes me think it might be something there.
I am going to check the fuses and the battery connection, as well as the battery in the FOB. Like I said, it was starting fine before I turned it down, so it makes me think there's a bad connection somewhere.
Let me know if you have any more thoughts/suggestions... thanks!