Help! Monitor not displaying after installing new graphics card

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Honorable
Feb 13, 2014
36
0
10,530
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
1Tb HDD
Windows 8.1