Hello;
I have a h9-1150t on Win7, came with a 550 graphics card.
I want to run 3 monitors at 2550x1440.
Tried several cards; a 640 worked instantly but the 3rd monitor was low rez on a HDMI cable.
Got a Radeon R9 270 and a MSI 660 card on the bench; neither works, black screen w/o cursor.
The extra 4-pin cable was attached.
I have a 600-watt psu.
So is this a UEFI issue? Old mobo issue? Ideas? Thanks!!