hello. i taken apart a old DVD burner from a disused pc, i got the laser out ok and it has 3 pins but i havnt been able to find or figure out how to connect it up only thing i found said to use old pc power supply and use yellow wire for gnd and red for positive but on my psu yellow is 12v and red is 5v so that dont make sense to me! i dont want to do anything dodgy or dangerous with it i have a cool project in mind but i need to get a dvd laser working can anyone help?