W520 extended out to LCD got fuzzy lines?

have been using these 2 machines for years already, i linked them up with a Display Port -> DVI cable, somehow now the Philips LCD got fuzzy line like this :
https://www.dropbox.com/s/yqa2lyt9llf1yj6/20150128_101415.mp4?dl=0
Tried with a VGA cable and used Nvidia software to extend screens, but problem still exists.
My machines:
W520 + Philips 240PW.

Does the Philips LCD work using another display source?
W520: i7-2720QM, Q2000M at 1080/688/1376, 21GB RAM, 500GB + 750GB HDD, FHD screen
X61T: L7500, 3GB RAM, 500GB HDD, XGA screen, Ultrabase
Y3P: 5Y70, 8GB RAM, 256GB SSD, QHD+ screen

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