The lights on the keyboard do not light up at all when you power the machine on. And the hard drive isn't even plugged in(but I had everything hooked up during the first attempt). I can't remember for DAMN sure, but I think that I can unplug everything except the CPU, memory and video card from this computer I'm using now and get it to post. It'll give me a buttload of errors, but my bios will at least display _something_ on my screen. I don't see how I'm getting bios warnings from no video card power, but no warnings with video card power, yet no image. Not to mention if you unplug the power supply from your motherboard, you can't even turn your computer on. All your fans are ran by your power supply, but won't budge unless your power supply is wired into your motherboard to complete the circuit.
I had a problem once on another computer with a motherboard shorting out because it wasn't elevated off the chasis, nothing would move at all until i fixed it.