Originally posted by: NWRMidnight
Well, first, I would reset the CMOS if you have not already done that. I don't mean inside the bios either, clear it using the jumper on the motherboard. All it takes is something to get messed up in CMOS and it won't boot.
If that doesn't work, remove everything but videocard, processor, and memory from compture (actually, only 1 stick of memory should be in) then see if it boots, if it gets as far as teh keyboard error, then shut off, plug in the keyboard, and try again, if it gets to HD boot error (no hard drive is plugged in yet) then shut down and plug it in, and see how it goes. It could be as simple as a bad ribbon cable.
I would also suggest reseating the memory, and video card at the get go as well because as time goes on, they can work themselves to a position that gives them a bad connection. This is caused from the constant temp changes of the hardware.
anyhow, it is all going to be trial and error, and you just have to test until you find it. It could also be a bad power supply, bad processor (or seated wrong). I had a motherboard that wouldn't boot brand new, it turned out that the processor was not quite pushed down in the socket as far as it should be and it got a bad connection.
Also, with the memory, if you have more then one stick, and you can't get it working, try the other, all it takes is 1 bad stick to cause many problems..
Good luck, and keep us posted.
Daniel.