Well got the solution in the end.
I was using DVI to the AOC but HDMI to the Samsung.
Ended up emailing Samsung. Got a very detailed reply. TV was in Demo mode. He gave me the correct settings to set up the TV how it used to be and it worked.
Also downgraded the nvidia drivers back to 188 (Correct me if I am wrong). But will update again to make sure.
Thanks for everyone who posted and/or read the thread.