I have an ATI 4550, Hdmi out and DVI out are being used. HDMI was the primary output for a month, added the dvi cable today. It is a 50ft cable. The latest driver and everything.
In the catelyst and windows 7 display windows I can see the name and correct reccomended resolution for the DVI monitor. I set it to mirror desktop 1 on 2. I go check the dvi monitor and its still on standby. Yet windows 7 acknowledges the brand/resolution automatically.
So why does it not output the signal to the monitor? Yet it knows the brand and all.
Res: 1440x 900