Try using a volt meter and check if the psu is geting 12V on the input leads. (blue if the ignition is on) If you are geting 12V on the red lead and the power supply is not blinking, check the fuse. If the fuse is ok then you have a defective unit. Make sure you connected the green and white wire to your power on pins of your mother board (pin6&8 i believe watch out for polarity, green is positive) if you do get to the part where the supply goes in to stdby mode ofcorse.(1 blink every 2.5sec) Just to make sure (because weve seen people do this) your input leads are on the big white connector which is located by the yellow coil (inductor), not the smaller one between the fuse and jumpers?