You might check your voltage switch on the back of the case to see if your running the right voltage. 115/230
I kinda went through the same headache not to long back. I basically rebuilt the machine twice plus other things like trying bare video card, 1 stick of memory .....blah blah bla
My fans were spinning, no video, no beeps no nothing. After about 4 hours I remembered I was showing someone my new case and they asked what that switch(115/230) on the back was for and I told them but was playing with it too.
Long story short, wrong voltage(230). Machine spun up fine after that.