Dell Precision M4800 Quadro K2100 graphics display problem

I recently bought a Dell Precision M4800 mobile workstation with a Nvidia Quadro K2100 GPU.

I am having issues on video playback - flickering and other lined artefacts towards the top of the display. This occurs during panned shots, rapidly changing images, etc. but this is supposed to be a super graphics card so there should be no problems.

I have tried playout on other monitors/projectors, all with same result. I thought at first there was an issue with the rendering of the video files I had produced from Avid Media Composer but I see the same artefacts on DVD playout and on video from Vimeo/Youtube.

Response from Dell ProSupport has been a little slow (they tell my I "only have basic support") so I'm posting the issue here in case anyone has had similar issues or knows a solution.

My guess is that the GPU is faulty, or perhaps the drivers (though I have checked if these are up to date, and they are).