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Hardware Thread, VGA Video spiltter, cannot see anything until Windows 7 logon screen in Technical; We have a classroom desktop PC with a DVI port going to a 2 port VGA splitter which is also ...
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    Question VGA Video spiltter, cannot see anything until Windows 7 logon screen

    We have a classroom desktop PC with a DVI port going to a 2 port VGA splitter which is also connected to the whiteboard's projector.

    We cannot see anything on the screens until the Windows 7 logon screen is displayed.

    Sometimes there is a bios message like press F1 to continue(BIOS battery died ages ago.) or sometimes the Windows 7 Safe Start text screen appears.

    Is there anyway for us to see the PC's display at all times?

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    Oaktech's Avatar
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    there is a good chance that the dvi port is not doing anything untill told to by the windows driver, i expect if you want to see it all the time you might need to use a vga port.

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    The PC only has a DVI port. The monitor has both VGA and DVI ports. The projector only has VGA.

    When I use a DVI-DVI cable between the PC and the Monitor directly the display is on all the time.

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    Oaktech's Avatar
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    Ok, then it is possible that the splitter is confusing the graphics card into not displaying an output as it is unable to tell what it is connected to, have you tried swapping the outputs of the vga splitter from one to the other as often one port will pass through the pnp signal so the graphics card can read whats connected to it? Failing that, you might have to try a different splitter, one that specifies that one port is pnp.

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    glennda's Avatar
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    I think its because your using DVI-D which outputs correctly to the Digital connection on the Monitor. When you try to use Analogue i.e through your VGA you are not getting any signal until windows starts sending a signal that can be translated to Analogue.
    You would need DVI-A I believe to get the info to display in VGA.

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