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Understand, but sometimes on some OS's, upon installation of video drivers, the display type gets reset and it needs to either be re-detected or setup manually.
What I would do is uninstall whatever drivers you might be able to through add/remove progams. Then I would manually change the video display adapter type to standard VGA.
I would then power down, and install the graphics card you want to use. If its the onboard one, thats fine, then just remove the PCI video card.
Next I would power up the machine. It will come up using the standard VGA display adapter, and is likely to look pretty bad. If the system detects the new video adapter you are using, let it install the drivers you specify. If it doesn't auto detect it, you'll have to install them manually.
Once that is done, go into device manager and specify the type and model of Monitor you are using.
Reboot if necessary and see if that cures the problem for you.
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