Interactive WhiteboardsProjector needs to be turned or else monitor is blank

The graphics card in the computers in question all have the white DVI outputs. These connect to a splitter that has two blue VGA connectors on the end. One of the VGA connectors is empty, whilst the other connects to VGA1 on the ActivBoard.

Then a separate blue VGA cable is connected at one end to VGA2 on the ActivBoard and into the computer’s monitor on the other end.

Is this a set-up that should work as it is? The signals aren’t going through any separate hardware as such, just a series of cables.