This is the first time I try the setup:two monitors on ATI 9550 AGP and two on ATI 9250 PCI. FSX only sees the 9550 with one monitor, and one unlabeled video card monitor.Three monitors (one on AG, 2 on PC) has worked fine until now.I even erased fsx.cfg and same thing.Any fixes for this?

What drivers are you using for your graphics cards? The newer ATI drivers do not support some of the older cards. I had to drop back to some drivers that are a couple of years old when I added a 9200 PCI card to my system. I ended up using Omega v3.8.221 to make the 9200 work. I finally decided it was not worth the effort for me and I'm running just two monitors on my PCIe card now.R-

I can't see how this can be a question of drivers, as I have been running a setup with three monitors on the same two cards successfully.I'll do a little test and disable the last monitor I added.