AT3705-MGW

I'm using the AT3705 with Vista Media Centre and when I try and set the resolution to 1920x1080 @ 30hz the TV has blurry lines across the screen. It's the same with all frequencies from 20hz to 30hz.

I have it connected with a DVI cable and the sound is on external speakers.

I have reinstalled Vista on multiple occasions, I have bought different video cards (previously had an nvidia 6200, the on board X300 and an 8600GTS to test and still the same thing. I've also tried the latest and older nvidia/ati drivers.

I have tried plugging my gaming computer into it which has Vista Home Premium 64-bit and it does the same thing when set at 1920x1080 @ 20-30hz

The highest res it works on without the blurred lines is 1360x768 @ 60hz.

My boss has exactly the same TV (bought at the same time) with the same operating system with older components and his works at 1920x1080 @ 30hz resolution without any problems.

Please find a screenshot of the problem here:
http://www.hemingati.co.nz/acer-tv-1080i...
-it was taken with an 8MP camera using a tripod.

Any help would be appreciated.