Hi,I have a dual monitor PC with one with a DVI connector and the other with a VGA connector. both have been tightly connected but only one screen (DVI) is working. And when I unplug the DVI cable, the VGA display Works and disappears when I put the DVI it back in. Both cables are newly replaced. pulled the power cables on both screens, pressed and hold the power buttons on both screens for few seconds still nothing.When started the widows sign comes on the VGA monitor and then i get the no signal found.i hope you can help me with this issue.Thanks,