No output to the ledwall

[Jedo]

Hi all,

I have a big problem. Last saterday i had no output to the ledwall on a gig. (not with vj program, not with another program and even no desktop background)
My laptop regonized the second monitor. It was connected with VGA cable -VGA to DVI adapter and de adapter on the ledwall signal booster. My first tought was that maybe the ledwall was defect. So i connected my pc to another ledwall in another area of that dance event. Same problem here, no output to the screen. This time it was connected with only a VGA cable and my laptop regonized the second screen. Second tought, maybe my graffic card is defect. So just to be sure i'll connected my laptop to a regular tft monitor and this works fine! I'll had output?! (setting: extended desktop).

Okay what's wrong here? Next thing was to try another laptop. So i borrowed a notebook of a friend and connected it to the (first) ledscreen with the same cable setup, this was working. But just to sure the next day i'll connected my laptop to a 42" LCD television with a VGA cable. This was also working.

Strange thing is that a week before it all works as it supose te be.
The problem occured after an reinstall of windows 7. But i can't figured out what the problem/bug is. I'll installed the latest grafic card driver.

Any of you an idea what the problem is or how to fix this?

The specs:
Notebook: Acer Aspire 5920G, Proccesor type: Intel Core 2 Duo T7300, Memory: 2 GB, Graffic Card: nVidia GeForce 8600m GT with latest driver (v 296.10).
Operating systeem: Windows 7 ultimate 32-bit

Software: Resolume Avenue 4.0 and Grand VJ

Greetz,
Jeroen