I properly have the answer to my question now..
The active adapter I have been using in the last setup (Old screens) Are not suitable for the new monitors, witch have HDMI input.
Today I have placed an order for a new active adapter, mini display port to HDMI.
Supplier : Lindy LDY41724 (This model is Eyefinity certified by dealer, but not by Eyefinity)
The adapter is out of stock, and will hopefully be delivered next week. At the same time I noticed pixel failure on one of the new monitors from Asus, so that one is going back.................
I will get back as soon as my setup are up running...