I just built a new PC and i turned it on today. When i plug in my monitor into my graphics card, nothing happens and there's no screen on the monitor. However when i plug it into the motherboard VGA, the monitor works and there's a screen and it goes to bios. Why do you think so? Is it because i haven't put in the graphics card CD yet or something? So do i have to install an OS and then plug into the graphics card?
GFX = Radeon HD 4870
GFX = Radeon HD 4870