i have really big problems

systems specs :

3500+ winchester
asus a8n sli
2 x 6800nu msi
1gb geilpc 3200 ultra-x
580watt thermaltake psu

cooler by a mach 2

i have tested in all way's , sli and sli disabled , all mobo led's are green , that mean everything is ok . but the monitoris not going on .

are the msi's not campatible ?

thnks a lot