config problems

[tbozo]

Hi,
I can't configure mame back to display on my arcade monitor ..
I used to but after some month of other duties, when I came back I couldn't find a way to get it back.
I'm using an old PCI card a Matrox millenium, arcadeos and mame and arcmon.
arcadeos and the dos are displayed all right but whenever it launches mame it switches to something that I can't display.
After changing my config files the best I could get two images in the length.
I've tried to launch mame only, but still the same result...

I ve also tried it on my monitor (because even if it can't be displayed my OSD tells me the frequency). On my new computer it's working but on the mame computer i allways switch to some kind of strange frequency(my OSD can't tell me)

Any idea ? please...