Video Splitter problem

We bought a brand new StarTech 4 Port High Resolution video splitter.
(link:http://www.kvm-switches-online.com/st124pro.html)

Anyway, we connected it together and it turns on, but it won’t show anything on the monitors(projectors). There is just a black screen.
We run the dual monitors at: 1280×768 for screen 1 and 1024×768 for screen 2. They work on the old splitter but it will now show anything on the new one.

I tried to reboot and reconnect and I disconnect all the wires and connected them again, but still no success.

For specs:
Graphic Card: nVidia GeForce FX 5700LE
Windows XP Pro

Please help as I need to set this up as soon as possible.

Thanks,
Nik