Computer won't turn on unless I unplug the main cable

MrSecretMansion

Honorable
Oct 20, 2013
19
0
10,510
Basically, my computerns fans spin up for half a second then turn off, but if I unplug the main motherboard cable* everything works fine.

Specs:
Motherboard: Am3+ Msi 970 gaming
Cpu: fx-6300
Cpu cooler: Coolermaster Hyper 212 evo
Gpu: Msi gtx 760 mini 2gb
Hard drive: 1tb seagate
Case: Nzxt Phantom 410
Psu: corsair 600 watt
Ram: 1x 4gb G.skill ares
1x 4gb g.skill ripjaws

*EDIT: Now it wont turn on no matter what cables I plug or unplug.

 

MrSecretMansion

Honorable
Oct 20, 2013
19
0
10,510


Turns out I did one of the dumbest possible things... I forgot to use the standoffs when installing the motherboard. The worst part is that this isn't even my first build...