Signage Player running in only 1 of 4 monitors

[evrgod]

Hello people.

I have a Windows 7 computer with 4 outputs ( 2xhdmi +2xdvi) and 4 monitors.
The player, after a while, runs in only one of those monitors. The other three, goes to windows desktop.
I have changed the video card, reinstall windows 7, changed HDMI cables, changed adapters...
I have others systems like these, but this is the only one with this issue.
Anybody know anything about this?

Thanks to everybody!

[mati 6]

use single video output and video splitter (VGA are the cheapest).

[evrgod]

I can't use like this.
It's an advertising videowall. 4 parts forming a single image and not the same image on the 4.
 
Tank you man.