That sounds like a graphic card driver issue. It is hard to tell without enough information from your environment though. I would recommend you take a look at this thread first:
There is a very good guide for setting up the graphic cards on the Wiki
That sounds like a graphic card driver issue. It is hard to tell without enough information from your environment though. I would recommend you take a look at this thread first:
There is a very good guide for setting up the graphic cards on the Wiki