Display settings, there is only one display

My show – “how to set in only a display, before I was on another computer display monitors, 2 of the two.Onda my card is the 8400GS PCI-E, S-Video output I connect to a TV, I can only display and switch on the TV show and not at the same time show (with only a single display mode) drive has been replaced many versions of this is the case, who is also a more appropriate version of the driver's recommendation (I have always thought that the problem is the drive) or some other favor of a solution, thanked! !

each card is different.can not find the same drive.to find the driver after driver to install the same is black.Old computer monitor showing two of the 1, 2, but with good.Should not be the same.