Cable: DMS-59 (DVI) to 2 VGA
Video Card: GeForce 8400 GS.
Latest Driver: 306.23 - installed a clean reset install of the latest Nvidia driver which came out last week.
Same Resolution: 2 of the 4 monitors I have tried have the exact same 'recommended' resolution (1280X 1024), both 60Hz, and I chose 16 bit color for both instead of 32 to reduce resources.
Ubuntu worked: Dual display worked immediately when I tried it in Ubuntu. So, it's not the hardware.
In Windows 7, the monitor on cable 1 displays during startup then powers off at login at the same time that monitor 2 powers on. Windows 7 behaves as though dual display is working even though the only time monitor 1 displays is on startup. For a single display, only cable 2 can be used as well.
'Extend these displays' in Windows Screen Resolution and 'Extend' in the Nvidia Control Panel is selected. And switching which display is primary nor switching which is in the left or right position in either control panel does not help make display 1 appear.
sounds like u have covered a lot. i think it's np with ur understanding to try something not so simple for diagnostic purposes. But be careful and read closely.
See, just to check it out, let's try checking device manager for ghost (hidden) drivers. (it was easy before vista and Win7 but now it is a little complicated.) And it use to always help performance and solve driver installation stuff; because of the old way that IRQs used to be assigned by Windows. But nowadays it's just part of diagnosing things. Only Sometimes does it matter. But do it anyways. But carefully. We're just researching.
1. Open a Command Prompt by going to Start>Run and typing "cmd" (without quotes). (For Win7 just type “cmd” into the startmenu and hit Enter.) Once the MS DOS prompt is open, type the following lines, pressing Enter after each:
Note, you can type "exit" (without quotes) in the MS DOS prompt window to close it at any time after this.
2. In the Device Manager window that opens, go to the View menu and select 'Show Hidden Devices' - this is very important if you want to see the unused devices. Now expand each of your devices and look through all the sub-components listed. You will see that some of the devices are shown in a lighter grey color.
3. For the purposes of this guide, what we need to look for are entries under the Monitor and Display Adapter devices. Under Monitor there should be one darker monitor entry for each monitor on your system. If there are any greyed out entries, you can remove them by right-clicking on the entry and selecting 'Uninstall'. Do this for all greyed out entries under the Monitor device.
4. Under the Display Adapter device, if you find two entries - a main one, and another one which has 'Secondary' next to it - these just indicate that your graphics card is capable of two separate outputs to two different display devices. You should keep both of these. Do not attempt to uninstall the dark entries under here. You can however uninstall all other greyed out entries under the Display Adapter device list, especially those which relate to previous graphics cards you have had on this system.
5. If you're feeling game, you can go through some of your other device entries and delete grayed out devices which you know for certain are no longer connected to your machine, or are traces of a device which has been moved around a few times. For example, under Human Interface Devices you may find multiple grayed out entries for a mouse which you may have moved from one port to another. As long as there is a solid entry for the device when it is still connected to your system, you can uninstall the grayed out ones.
6. A final word of warning - I do not recommend uninstalling devices which you are not sure about. Most importantly, do not uninstall any grayed out Microsoft (or other Codec) entries under the Sound, Video and Game Controller device, and be extremely careful about entries under the Non Plug and Play Drivers, and Network Adapters device list. If in doubt, do not uninstall a device.
If you do happen to uninstall a device which is still connected to your system, it's not the end of the world. Windows XP and Win7 will usually re-detect it upon reboot and look for drivers to reinstall it. However I urge you to take caution with the above procedures and only do Steps 1 - 4 above if you have any doubts.
Credit for the above goes to: TweakGuides.com - Nvidia Forceware Tweak Guide
Let me know wat u find, nikpapag, and we'll cover properly uninstalling drivers and reinstalling them. GL