You may want to make sure all of your components are properly seated. It's possible that something may not be fully inserted into it's socket and therefor is not receiving enough power to operate properly. It may sound kind of insulting to suggest that to someone who knows a bit about...
Your motherboard manual says you can clear the CMOS by touching the pins with a metal instrument, such as a screwdriver, for a few seconds. You should see something that says "clear_cmos" on the side of the motherboard labelled F Panel where you can do this. That should get your bios to...
If possible, try connecting the screen via the VGA connector instead of HDMI. You may need to use the onboard graphics just to get into windows and change the primary display device to the video card. Make sure to update the BIOS and graphic drivers while you're at it if that works.