Different than the other dual monitor black screen setup threads I've seen here so far (at least I haven't been digging around enough) Went from an HD5670 to 6670 (one step up for median tesselation support) I have 2 monitors, one 1920x1080 and 1680x1050 (like Ali_93's thread). The 16:10 monitor is a Vison 21.6" LCD that I picked up 3 years ago during Black Friday (when 16:10 was still the norm ), and the 16:9 monitor is an Acer G215HAbd 21.5" which I picked up a few days ago. My :Windows 7: PC will boot fine from POST to login, but that's where it stops; Screen goes black once it finishes loading up the startup services. I am POSITIVE that it is driver related, for 10.6 worked on my 5670 before I made the switch. I've tried switching the cables around (VGA, DVI-DVI, DVI-HDMI) and no dice. I am unable to rollback the drivers to the last previously "supported" drivers as the 6670 cannot use drivers under 11.1 (it will not work in the 11 range). The 10.6 HDMI/DP support is installed, but I dunno if that provides much help to the situation. I do not want to have this old paperweight sitting on my desk, nor do I want to put in another painstaking investment to find another 16:10 monitor (the 1080 I have is going to be swapped with a 16:10 monitor that my acquaintance is willing to swap (that and I am more inclined to use 16:10 resolutions in games)). If there are ANY solutions please post any suggestions that might pertain to the problem ;O) Edit: If anyone is going to ask for faulty ports, I can 101% guarantee you it's not, for this problem has persisted on the old 5670 with 11.1 to 11.3 Edit 2: Been reading around, it maybe the DVI cables. I am not sure what kind of DVI plug on the old monitor. It could be using a DVI-I or DVI-D. As for the cable itself, it is a DVI-D cable. Edit 3: Forgot to put the status of the monitor if it's turned on. Standard fare, the monitor is on with the active (blue) status light, yet no display. I do remember encountering this problem in the past with the same monitor, however I forgot how I solved it. Damn.