IMac 27" DisplayPort input from Dell E6500 jittery

I bought a DisplayPort-to-Mini-DisplayPort cable from circuitassembly.com in order to output video from a Dell E6500 (a work issued computer) to my iMac 27". It mostly works but occasionally there is a jitter/distortion intermittently, maybe every minute or so.
Has anyone run into this and if so, was there a way to stabilize it?

It could be as simple as a defective or poor quality cable. Have you tried swapping it out with another?
Roger

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