First of all, thank you all for quick response. No, I can't give you any specs on the computer as I never seen it working. As mentioned before the computer is really simple: Mobo, 1 Hard Drive, 1 CD Drive, and CPU + Fan. The power supply is working 100% because I bought it yesterday fresh from the box, everything is connected properly I double checked it. When I power it on I was hoping to at least see the power supply start but no power supply no other hardware will function, except the green light on the mobo.
A bit later this evening when I get back from school I'll post some pictures, although it may be possible that the mobo is in contact with the back cover case which won't let it power up, it happened to me last time. I'll update you guys later on today. Thanks again.