A friend of mine recently purchased hardware from newegg to build his own computer. He put everything togehter once to find out his ram slots on his motherboard (biostar) didnt work. So he returned it and got a new one and this time when he put some parts together the computer would not start with the 4-pin (square one) hooked up to the computer. So i told him to hook everything up and it still did not work. So he went out and bought a new gigabyte motherboard and same thing. My question is his parents are getting tired of replacing things so what do u think is the main cause this computer refuses to boot up? Thanks for the help.