I have a old PC , PIII 600 which looks like the on board graphics card has broken. I am getting cable not connected from the monitor. The monitor is fine, I have tested it on other PC's. I have installed a PCI graphics card, but do not know how to get the PC to recognise it without disabling the onbaord on in the bios. I cannot see the bios as the monitor will not pick up the onboard one? Please advise?