So I'm fixing my friend's computer and long story short, it's finally done. Case is new, mobo is new but the rest of it is old. Everything seems to be hooked up right but it won't boot up. Nothing comes up on a monitor, none of the fans work, the only thing that works is the led in front of the case which just blinks on and off over and over. The main power wires are connected and the switches are set up properly according to the manual. So does anyone have any ideas? Although I had it running manually before I got the case and the fans were running.