iMac MDP external display issue

Hi

I have been sufering with the issue mentioned in this thread :

http://forums.macrumors.com/showthread.php?t=846136&highlight=mdp+external+monitor

I am trying to connect my Samsung external display via a 3rd party MDP to DVI adapter > DVI cable to my Samsung monitors DVI input. I have searched for months for a solution to this isuue but have been round in circles (it seems that everyone else is also).

Is it possible to hook up a display other than an apple display using the MDP?
Do I require a single or dual link DVI link for this purpose?

I have considered that the 3rd party adapter could be causing the issue but I have read so many other posts of people having external monitor issues with the genuine apple connector too. Could anybody advise me if the genuine adapter could/would resolve these issues?

I have been hoping that each update that comes out fixes the issue, but no such luck.

Any help or advice is greatly appreciated

Fisherman19