Dualscreen Samsung Syncmaster 204b

Hello Forum.
I've just got my mac mini which should be used for music.
This means I would like to have dual monitor. I have 2 Syncmaster 204B which have worked perfectly with my PC. Now I bought a Mac Mini -  I'm trying to connect abd setup dualscreen, but no matter what - I can only get one of them to work. I'm sure the screen is working - connect to a PC Nothings wrong.
I've tried the following things:
* Connect the screen directly using HDMI/DVI, HDIM-adapter+ DVI cable, Thundbolt and DVI canle - the screen is block.
* Using screen nr2 with the same things - everything works. - although connecting the other screen, I can see the mac mini is discovering the screen - but still blanc screen.
Now I'm pretty frustrated over this - since this gives no sense. I've googled and found a lot of things that I've tried - but in the end - the same result - 1 screen working - the other one blanc.
If I connect a Samsung TV or anything else - It'll worked perfect.
But that It will not work on 2 exact same screen - i don't know what to do
So If anyone have a solution for this - I would really gratefull for this...
Thanks in Advance
Jan

No - I'm Saying.
Both Screen works From A Windows PC with DVI to DVI.
Mac mini Works only with Screen nr 1 (with thunbolt/DVI cable ## HDMI/DVI cable ##  HDMI Adapter and DVI cable.)
Screen nr 2 Does not work woth anything from Mac mini - but works fine from PC. When connected to Mac mini - it is registered and input but blanc.
When Connecting Screen nr 1 (Regardless off Thunderbolt/HDMI) this work. Connecting screen nr 2 Gives me :
Screen nr 1 works
Screen nr 2 Black and blanc - Allthough I can see the monitor register an input.
Connecting the same cable to a Samsung TV - it'll gives a picture - and dualscreen works.
I've tried reset NVRAM - tried autojust the screen - but it is the exact same monitor as the one that works.  I checked all settings in the monitors menu - everything is exactly like the other.

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