Hello, recently, I bought 3 optiplex GX280 and a LCD ViewSonic VG700b, from the companny where I work. they had to remove the OS before they sell these computers to their employees. when I tried to connect the monitor, all I could see was "no "signal. the optiplex has an integrated video card and I need to install the OS. but how can I navigate the installation if I can't see anything on the monitor. I feel very lost and I would greatly appreciate any help that you can provide.