dual monitor vga flickering

[eodeo]

Hi,

I've just purchased a 42" tv that I connected to my gtx 460 with a hdmi cable and a hdmi to dvi adapter.

The problem is that my old 24" monitor is now flickering. Its connected with a vga cable and vga to dvi adapter directly to the GPU. I tried connecting it with both DVI ports on the GPU and it makes no difference. As long the 24" is the only connected monitor- all is well. As soon as its in any sort of dual display configuration its flickering. 42" tv is working flawlessly in all scenarios.

24" does not have anything but the vga port to connect with.

I have windows 7 x64, sp1 with latest nvidia drivers 275.33 (2 VII 11). Its a clean install of windows. My msi gtx 460 also has a mini hdmi port. Not sure if that's relevant.

Any help much appreciated!

 

[LoneNinja]

This information may or may not be of any use.

I had a similar problem a while back with a Radeon 4670 on a dual display, one monitor would always flicker if both were active, but either one worked fine on it's own. There was some kind of driver conflict with ATI's Catalyst Control Center and their overclocking portion of the software. Returning my 4670 to stock clocks got rid of the flickering.


Another thought that comes to mind is that it may be caused by having different refresh rates set for each of the 2 displays.

 

[eodeo]

My gtx 460 is msi factory overclocked version. I dont OC GPUs, so I wouldnt know how to downclock it.

Both my monitors are LCDs, using 60hz. One is 1920x1200 (24) and the other is 1080p. I used the 1080p as the lowest common denominator.