Without swapping parts it is hard to tell but the lights not coming on points to the board.
Really? I'll try more experiments later, I can't really borrow any spare motherboards to try.
Wouldn't the lack of LEDs indicate a PSU issue? Not trying to contradict or confuse but I am just curious.
I'm not so sure since I'm not really good at technical stuff with regards to computers but I know how to buld one.