booting up first time custom build but when i plug in a black connector from my psu i get no power even if its not connected t

Hoodmonkey

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Nov 11, 2015
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so just finished building a new tower, hooked up my GPU (radeon HD6870) from my old pc with the same PSU (OCZ600MXSP) so it boots up fine when when all i have a is the mobo (ASRock 990FX Extreme) and GPU hooked up but when i plug in a black power cable from PSU to CPU connecter i got nothing, even if i remove the end connected to the CPU i still get nothing, any ideas?