GTX280 won't drive the secondary display

[Kyanzes]

So:

Vista 64 bit SP1
January 22nd NVIDIA drivers (also tried older ones)
GTX280 + 8500

Displays: two 24 inch displays + plasma

The plasma is hooked to the 8500 while the two 24 inchers are attached to the GTX280.

The plasma works fine. The "main" 24" display works fine. The secondary won't power on.
When I switch the two 24" displays (I swap the DVI connectors) then the "secondary" starts to work and the "main" becomes blank.

Ofc tried to set the "Multi display/mixed-GPU acceleration" attribute.

Possible settings:

Multiple display performance mode
Single display performance mode
Compatibility performance mode
Single GPU multiple display performance mode

*NONE* of the above settings will activate my secondary display.
*OFC* I've also "attached" the secondary display in both Nvidia control panel and Vista's display manager.

Deactivated all 8500 video ports and tried everything from the beginning.

Nothing seems to work.

Interestingly enough the NVIDIA control panel detects my secondary display since it's listed in the "set up multiple displays" menu. It's correctly displayed as "activated" and "attached".

Again: when I swap the connectors the whole thing works the same except the two displays change roles with one of them working and the other isn't.

Any thought on this guys?

 

[Tempered81]

remove the 8500 and try nvidia control panel - setup multiple displays.

select clone. See if you can get it working without the 8500. Also you might try one 24'' and the plasma cloned on the gtx280.

 

[Kyanzes]

Now I only have the GTX280 in the comp, still the same issue with new drivers. What a letdown.

 

[fleshconsumed]

You probably got defective videocard. I have almost similar setup to yours. Vista 64bit Ultimate SP1, GTX260+8500 driving three 24" displays, everything works (except for card being stuck in 3D mode clocks, but that is a separate issue).

EDIT: maybe also try swapping DVI cables.

 

[nitromullet]

Have you completed setting up how you want it to work under the "set up multiple displays" menu? IIRC, if you don't do that the second screen doesn't work until you apply any changes.

 

[Kyanzes]

Originally posted by: nitromullet
Have you completed setting up how you want it to work under the "set up multiple displays" menu? IIRC, if you don't do that the second screen doesn't work until you apply any changes.

Yes, both monitors are indicated as being active.

Also, I can't find the settings page to set "clone" or "separate" display mode. Could be missing.

Tried several drivers, tried swapping cables, nothing helps.