I have an older compaq motherboard with a 600mhz processor. I installed a new motherboard and the old one was working fine when I replaced it. I now put it into a new box and hooked everything up. It starts up, but the video doesn't work. The pci video card that I'm using for it works fine. There is no beep on startup, thought it may have been the memory but they work fine also. I am out of ideas. Can anyone help?