Help! Monitor not displaying after installing new graphics card

Just purchased a Galaxy GeForce GTX 650 Ti Boost 2gb from Bestbuy for my PC and after placing it into my PC and powering it up with HDMI, the display screen is black. Any suggestions? I am kinda average with computers.

Inte(R) Pentium(R) CPU G2020 @ 2.90GHz
Ram 4gb
Intel HD Graphics
Antic NeoECO 620 Watt 80 PLUS Bronze
Windows 8.1
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  1. Best answer
    You disable the Intel HD?
    Plug the 6pin to the 650?

    Just in case check that you are not getting signal from the mainboard vout.
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