OK... Power... Looking at the board pic it isn't easy to see if there is a 4 pin (straight) plug on that board, is there (possible you don't have it because you do NOT have a North or south bridge that needs that extra power)? If there is do you have that plugged in? At the top of the board you will see a 4 pin (square) plug, do you have that plugged in? On your video card there is a 6 pin (square) plug, do you have that plugged in?
Jumpers... Make sure ALL USB jumpers are set to OFF (set to off not taken off the board). "Most" new mobos have a USB "wake up" and if you don't have anything in the usb port to wake the computer up it is possible you will boot up but NOT see anything on the screen.
Video card... Your should be in PCIe slot "1" (closes to CPU) with the SLI switch/card ( flipped to "what ever it says for one card"). PULL the card out and reset it AGAIN in slot 1, maybe you just didn't have the card set. Look down at the gold contacts and make sure they are all even with the pci slot form left to right. If you see them going up from left to right or right to left the card is NOT in all the way.
Beeps on boot... IF there is a problem you should be getting beeps of some sort. Normal operation should be one beep or even maybe 2 that's it. If you are hearing beeps like ***/* * * */ *** and so on then you have a hardware problem of some sort. So we need the info on beep sounds if you have any.
Now you can try this right now... 1st clear the cmos, in your book you will see how to do that with a jumper. Unplug your hard drive (that's right unplug the hard drive), unplug you CD/DVD, unplug your mouse, remove ALL PCI cards (NOT video card) and remove "1" stick of ram, in other words just have your keyboard and video card hooked up to the mother board, that's it. Now, boot the computer and see if you get a screen then, if you do you just found out a few things, you have all power plugs on, your video card is NOT bad, so on and so on. WAIT, WAIT read >>>> After power on if you see that screen you are NOW going to get beeps because you have your hard drive out and you have no mouse, so now turn the computer off and hook up your hard drive, reboot again, see where I am going here? So just start adding things back to the computer one by one until you have no screen again, that part you just put in is your problem (just maybe it is your cd/dvd drive).
Well that should get you started, let us know.