Assuming there is nothing wrong with your motherboard should you not be able to get a boot screen with nothing but the motherboard bios? Even if the cpu is not working and the hard drive is not working should not the bios alone give you the initial boot sequence on your monitor? I just installed a replacement motherboard but I get nothing on the screen. The fans and all the leds come on but nothing comes up on the screen. I know the monitor is ok. The hard drive may be faulty but I should still get the basic boot. What about the cpu? If it is bad would that prevent the bios boot?