I am installing some projectors at a church and can't seem to get the front projectors to find a signal. The setup is a laptop with a usb-to-vga adapter running one projection on the back wall (works fine) and another feed coming out of the laptop's factory hdmi port, running 80ft heavy-duty hdmi cable, to an hdmi amplifier, 6ft cable to an hdmi splitter, to 2 20ft hdmi cables down to two optoma projectors. The computer (running windows 7) recognizes that it is connected to an optoma projector, but it won't pass the signal to the projectors. Any ideas?