Hannspree HF289H Monitor going white

I have had one for about 2 years and never had an issue, I recently bought another to have two monitors hooked up for graphic work. The first one I got started to mess up a few weeks in. The screen would get vertical lines in it (the screen looked like it was vibrating) and then it just went white, and would not display anything. So I returned it and got a new one, figured maybe it was a fluke. Well about 2 months later this one just did the same thing. It is going to be fixed, but was curious if this is something my computer may be doing. I am running an aftermarket card (GTX8900 - 512mb) on a Vista machine with 4gb ram.

Any help will be appreciated.

Thanks.