Black screen on Display Port cable with Nvidia driver!!!

[DEADLY360]

I've just posted video on YouTube Link-->http://youtu.be/h_ty_cedM6s
I need help!!!!!
I have no idea what's going on
I've tried VGA & HDMI cable, no black Screen Problem
But when I try DisplayPort cable black screen just appears after few seconds!!!
I've checked with the Sabertooth intel hd 4000 display no black screen problem occurred
Nvidia driver:344.60 latest driver
Monitor: AOC I2477FWQ
Nvidia GT430
Asus Sabertooth Z77

 

[DEADLY360]

ANYONE?