Thanks for all the help guys, I went to my cousins place and used his power supply, everything worked fine, bios screen showed up, fans started spinning. Tried it with the graphics card on and 2 sticks of ram, everything worked.
So, conclusion: Power supply was bad, I had the EVGA Supernova 650W 80 Gold Plus, I'll be buying a new power supply and update you guys once again if it works.