2 Monitor Setup Problems

[TheTimeIsUp]

I just got my 2nd 2001fp in the mail today, so I am tryign to set it up. Here is my problem.
I have 3 slot for monitors on my computer (2 blue, 1 white). I know that one of them works perfectly(a blue one). I plug it in, the screen goes blank and starts up when I turn my computer on.
The other blue coord doesn't do this however. It goes black like the other screen when turned off (indicating that it should work) but when I turn it on, it stays like that.
When i plug in the white coord, The screen pops up with a self test, which indicates that it isn't plugged it.
I know all 3 of them should work, and I am gettign frustrated trying to get just 1 of the 2 to work.

Help?