Just finished putting together a new PC for my parents. But when i turn it on, the monitor doesn't light up. The PC itself seems to be working - the CPU fan is spinning and all. But the screen just doesn't light up. The parts that are connected are: cpu, ram, video card. The monitor is supposed to light up with just these parts connected, right? I tried plugging in the floppy drive too, but that didn't change a thing - the light on the drive stayed on though, if that means anything. So anyway, what's wrong here?