Sometimes my second monitor doesn't come on when I boot up.

[TheNoodleMan]

9 times out of 10, when turn my computer on, both monitors come up no problem. Every once in a while the 2nd monitor doesn't come up. When this happens I just reboot and that solves it, but its frustrating and annoying.
Both monitors are 2001fp, and they are on seperate cards, one an ATI and the other a NVDIA. I have checked the video card, and it is seated properly. Any Ideas?