I hope you can help out on this one.
Since I got that new LG 5700 Full HD screen in the living room, I wanted to attach my pc ( specs in sig) to it. So I bought a 10 m HDMI cable and plugged it into my graphics card with an DVI to HDMI adapter. My primary display is a Philips 200 WS 20.1" @ 1680* 1050. When plugged in both displays are shown in the catalyst control center. When setting the LG as Clone everything works fine and I get a picture on both of the screens, but when trying to push some settings, like the resolution or any other setting (in the displays manager of the CCC) for that matter I get a grey screen with light grey lines running from top to bottom on both screens for about 10 seconds and after that I get back to the normal desktop, but my pc has frozen, and doesn't react to anything, not even the clock on my keyboard works. I get the same thing when trying to set the LG to extend my desktop. When only running one of the displays everything is fine and I can play and work on it, but when trying to get both to work at the same time It sometimes works for a while but I get random freezes.
I would be thankful for any recommendations
