Well, ... it´s a PC-Chips!

But seriously, this might be dried out electrolytics. This even happenes when the board has never been used. And it´s from the "bad capacitor days".
Do you happen to have a picture

Did you check the bios battery or install a new one? I've had my fair share of motherboards that either won't power up or just act very weird if the battery is low or missing/dead.

Also I'd check and make sure that your PSU had a good strong 5 volt rail I would suggest minimum 25 amps but 30+ would be better.

Thanks @chrismeyer6 and @majestyk, I measured the voltage of the battery:

But guess what, I went and got a new battery and replaced it anyway, it works now!

In any case, this is a pic of the mobo, thanks a lot for your help folks!

That's very red.

Problem with measuring batteries out of circuit is that the voltage can recover, but there's no actual power there. So as soon as anything tries to draw a current the voltage drops again. You can get a better reading by either measuring the voltage in circuit, or by sticking a resistor (say a 330 ohm, so trying to draw about 9mA@3V) across the battery terminals and seeing if the voltage holds up.

Excellent I've had my fair share of motherboards with dead or weak batteries that show no signs of life untill you replace it. That's a good base for a nice socket A build.

Nice! and yep a new bios battery makes many otherwise dead motherboards come to life.