Using Windows 7. I have a new ATI Radeon HD 5830 video card and I was trying to get two monitors working when my LG LCD monitor wouldn't work as the second monitor (I also describe what I thought was the problem in Radeon 5830: How to get two monitors working?)
My LG W2631V monitor does not want to work with this video card. I have two other monitors that both work fine with it even using dual screens but I cannot use the LG monitor as a second screen or even alone because it seems to be stuck in power saving mode. My video card works fine with two other monitors.
The LG works with my laptop via VGA connection. Also it worked via DVI with my previous video card.
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; when I shut it off and turn it back on the on screen display briefly says "DVI 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.
Then I read something about video driver updates and frequencies being out of sync. I'm lost.