Alienware Area-51 ALX issue. (Won't boot.)

I've ran across a weird issue, and would like some advice before I start tearing down my system and troubleshooting, I appreciate any helpfull help I can get.

I've start by running through my speccs:

CPU: Intel i7 990X

PSU: Standard Alienware 1200 Watt supply.

GPU: Nvidia 580 (2x, SLi'd) (There's no branding, so I can't tell what brand. I'm assuming Dell provides their own version? Have the same speccs as the ordinary 580)

RAM: Kingston HyperX (3x 2GB, 1600)

Drives: Irrelevant, but I have 2x HSSD's at 500GB each, running in RAID0, and a Corsair Force 1 SSD where I store my Windows on.

Discdrive: Irrelevant.

Motherboard: Alienware 1366 Socket.

My problem is that I can't boot my computer (As stated in the title).

When I press the power button the only thing that I notice is a clicking sound in the PSU. Neither fans nor the motherboard boots up.

When I plug in the power cord, the ventilation flaps does its normal routine of opening and closing, the lights in the chassi flickers and strengthens (Which I assume is the PSU taking over the supply from the batteries) and the MIO boards orange lamp lights up. The problem first occured when I shut of my computer and I went to sleep, when I woke up this problem arose, and still persists. The Windows close-down were normal, no abnormalities. At first the orange lamp on the MIO board died out when I pressed the power-on button, but now it doesn't. I also changed the batteries for the lighting to new ones.

My hopes are that it's not a problem with the CPU, as it's the jewel of my computer, but the Motherboard would atleast power on if it'd be faulty.

It's either something with the MIO board (Which is where I need help, as I have no experience whatsoever with Alienwares, and I've never had a seperate MIO board;

Or it's the PSU, which I find doubtfull, as the motors in the chassi are still working flawlessly (Both the flaps and the front drive cover).

Or something with the motherboard.

Is there any I/O pins on your motherboard, or are the only ones present positioned on the MIO board? If it's a MIO board issue I'd rather bypass it and just plug the Startup Button directly to the motherboard so that I can atleast boot the computer, and just plug the fans directly onto the board aswell.

//Niklas Andersson!