laptop display problem

[webbsc]

I have a hp pavilion zv5000 laptop w/ ati mobility raedon 9000agp. It is about 1 1/2 yr old and haven't had many problems w/ it. i did my show on wednesday w/ no problems, but went to do my show last nite and the dual display will not work. It worked fine on wed. I can't get it to recognize the second display. Has anyone else had this problem or have any ideas of how to fix it? I have updated my driver and everything on that end.
thanks,
simon