Apple 20" Model A1038 Screen Shake

I recently purchased the DVI to ADC adapter to connect my Cinema Display monitor to my PC that uses Radeon HD 4850 video card. The monitor displays fine, but ever now and then the picture shakes vertically. I do not know what is causing this shaking or how to stop it. Any suggestions would be greatly appreciated. Thank you.

Yes. Treat its Thunderbolt port as if it was a Mini DisplayPort when choosing an adapter.
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