No/little power to PS03

I just finished a PS03, as well as as two T15's, but for some reason the power supply is hardly getting any power. The -30 LED begins to blink faintly after a few seconds, but no others. This seems quite weird, considering the power supply came assembled and all I wired was the ground, power switch and the large LED. I have attached both modules to the wiring harness too, but it yielded the same results. Any help with my situation would be greatly appreciated.
Thanks!
Thanks!