Computer wont boot after installing GTX 760 graphics card

ferwindjacks

Honorable
Jun 26, 2013
632
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11,160
Hello all,
So I got all my parts to build a new computer for a friend today. Building was no issue, and the computer boots fine with no GPU and I have successfully installed windows 7 (no drivers have been installed, was installed with no internet). However, whenever I plug my graphics card in (I plug in the 6 pin and 8pin) the computer boots but it has "no input". I need help fast!

Specs:
Asus Z-97 A mobo
8gb corsair vengeance (1 stick)
i5 4670
XFX 550w bronze
Evga gtx 760 dual SC