Well,
I don' here it loading anything and it is a loud one.
On top of that the light comes on as soon as the pc comes on, normally it should come on after POST right? which is when the hard drive starts to spin?
But this one is on along with the power led.
Ahhh Haaa...!
You have another problem, which I have had in the past...
The computer locks-up during POST.
It was worse on Win '98. but I occasionally get the prob with Win XP.
I generally have to shut the 'puter down....wait for a while...then re-start it again.....
I know exactly what you mean now...

...!
The light stays on and the 'puter doesn't boot into Windows...

...!
Cheers ....
Paul.
P.S. Have you installed all the Motherboard drivers from the CD which you got with the new Motherboard...?
Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.