Computer shuttong off 1 second after start up

Brand new computer.

i5 4670 CPU
Corsair 750 W power supply

Gigabyte ga z87x d3h motherboard

I turn the computer on, and it starts to boot and immediately shuts down. THen it repeats that cycle unless I unplug the PSU.

Things I have tried

Switching memory sticks
Unplugging everything except motherboard and PSU
Resetting CMOS by taking out the battery.

THe PSU was working 30 minutes ago when i took it from my old computer.
3 answers Last reply Best Answer
More about computer shuttong start
  1. Does it stay on long enough to give you a beep code?
  2. Best answer
    User error. Both power cords had to be plugged in. Found it in another tomshareware thread
  3. Ah, yes it helps to have all the power cords plugged in.
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