I currently got my 2nd rig running and I had a spare CRT monitor from one of my emachines back in the days. I bought a DVI adapter so that I can connect it to the onboard of my 2nd rig so I can simultaneously use both computers at once. However I get no picture when I connect my old monitor. If I disconnect the LCD from my main rig and hook it up to the other rig then I get picture. What can I do to fix this???