How to use a external monitor on FB7/Gnome

[Kemian Dang]

Dear All,

I use a laptop with Freebsd 7.0 stable and Gnome 2.22, the graphic card is
integrated nvidia go 6150.
I want to  use a external monitor to support my work, but I find it gave no
display when I plug the monitor, with the Fn + f4 key(this works in
winodws).
Seems no related topics in hand book / mailing list, so anyone could give
some clue?

-- 
Best wishes,
Kemian