Dual Monitor Problem

[chriswatts]

I have a 23' LG screen through DVI-D and a 21.5' LG screen through D-SUB (VGA cable) I have an NVIDIA GeForce GTX 550 Ti. The second monitor keeps blacking out into D-SUB power saving mode. I have turned all my power saving settings off as well as my hibernate and PCI express. I have upgraded my PC power supply from 400W to 600W but am still getting the same problem. I have read that you have to set up dual monitors through NVIDIA settings but cannot find the way to do so. Everytime i go into the control panel for NVIDIA it has both screens up there. I have no idea what else it could be. Any help would be much appreciated.

[chazus]

Are the drivers updated? Usually the control panel is included with that, but I've never had to use the control panel to manage dual screens. I was running dual screens without a problem on a 460. It sounds like either a cable or card problem, possibly.

[Aqua]

Err yeah update the drivers I don't know what that's happening. I'm on Dual Screens myself, nothing wrong here.
Try to go to the visual/colour settings and 'reset' them. See if that helps.

Occasionally one of my screens will dim after a reboot and doing that will sort it out.

[Djinni]

Have you extended your displays through the Windows "Screen Resolution" (found by right clicking in empty space on the desktop) Quite often a second display will default to off, rather than mirrored like is usually the expected default.