I have a user who had to replace her computer. The video adapter is an ATI Radeon HD 6350 in a Dell Optiplex 790 running Win7. The connector on the back of the card is one of those DVI where it's all pins and used to connect a DVI splitter cable for dual output. Each of the outputs from the splitter cable is a DVI-I Dual Link and the connector for the Apple display is DVI-D dual Link. I can't go above 1220x800 (or something to that effect). I have the most recent drivers from ATi installed.
I believe it's because I need a video card with DVI-I dual link connector on the card itself but I'm not sure. The supported video cards listed on Apple's website is outdated - you can't find them anymore. I can't pull the video card out of the old system because it's AGP and the new system has only PCI slots.
I'm looking for a fix or a video card that can be purchased that will support this display.