I use this monitor with dual-dvi connection which came with the product. I have a Ati HD5970 GPU.
I tried both hdmi connection and dvi connection. Monitor doesnt show post screen or windows 7 splash screen until the logon screen of windows.
I also tried mini displayport to display port cable of this product. Monitor simply doesnt work at all with this cable. I couldnt determine whether it is my GPU's fault or cables.
But VGA connection shows post screen somehow, but I dont use analog connection anymore.
I also have seen my problem in this post http://en.community.dell.com/support-forums/peripherals/f/3529/t/19497235.aspx
I tried things suggested in that post like turning off fast boot, switching GPU's output conncections. Nothing works, I need help