Turns on, lights up, fans spin for a second, turns off! Help!

[dezork]

I know this a very common and vague question, but here's the thing. All my components are compatible, I just upgraded my CASE. I'm using:

Corsair TX750 PSU

Gigabyte z68-ud3

16 GB Corsair Vengeance (4 x 4GB)

The problem is not the GPU, because I've unplugged everything but the CPU and the power button, one stick of memory, and CPU cooler. Still the same.

I also removed the motherboard from the case and tried again, in case it was somehow shorting there.

Please help! This was working a couple of hours ago, in my other case. I have no idea what could be different, or wrong.

 

[SwollenGoat]

double check your connections from the power/reset switches to the mobo? I've seen the same behavior and it was the case power switch in the wrong place.

 

[HugoStiglitz]

Can be if the CPU fan is plugged into the wrong header on the motherboard.

motherboard thinks the CPU fan is not plugged in or is notspinning and turns the system off as a safty precaution.