Hi I bought SB i5 2300 with msi h67ma-e45 MB . when I work with on-board graphic It has no problem . but when I connected videocard (GTS250) when I run 3d programs (games or windows 7 rating) every thing freezes and I doesn't enter the game .and I have to reset computer . I thought it might be my VideoCard problem so I used another Video card (my brother's 9500GT) and this time even it couldn't start up windows . what do u think problem is ? I think it is MB PCI-Express slut problem .what do u say ? (535W power , 2X2Gb 1333 ram)
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When you added the stand-alone video cards, did you install the current video drivers from Nvidia?
You may need to remove all current drivers (google and download/install/run driversweeper) and then re-install from scratch.