Using Windows 7. I got a new Radeon HD 5830 video card with 1 DVI, 1 HDMI, and 1 DisplayPort. I'm trying to get two monitors working. First monitor connected to DVI port works. Second monitor connected to DisplayPort (via adapter) doesn't work. Also I've been reading something about active vs passive DisplayPort adapters. I'm not sure which I have and I'm not sure if that's it.
Any ideas? Should I get an HDMI to DVI adapter instead?
The plot thickens. I tried disconnecting my first working monitor and then connecting my second monitor, an LG W2361V Flatron, using DVI (instead of the DisplayPort as above). I fully expected this to work but it doesn't. The monitor works via VGA (hooked up to another computer) and also previously worked with DVI via DMS-59.
I got a spare monitor and hooked it up via the DisplayPort, and, voila!, I have two displays now. So presumably it's not a video card or adapter issue but a monitor issue. However, I'm thoroughly confused now.
My LG monitor says it's DVI-D if that makes any difference.
I found this site: http://www.avsforum.com/avs-vb/archive/index.php/t-1211892.html which seems to talk about a similar issue. I would agree that the monitor seems to be stuck in power saving mode? The red power light flashes on and off. So based on what I read at that link I booted windows in safe mode using my working monitor via DVI and then switched to using my LG monitor and lo and behold it displays an image. Progress! However from within safe mode I right clicked on the desktop and went to screen resolution. The resolution was set to 800x600 and when I clicked save to close the dialog box the monitor went blank (again appearing to go into power saving mode). It would not wake up despite key presses and mouse moves.