New comp build no onboard graphics for mobo, graphics card will not display

Specs
Motherboard: MSI 870 G45
AMD athlon II dual core 3.2 ghz
HIS Radeon HD 4670 GPU
6 GB ram

Basically when i turn it my comp on nothing displays not my processor i checked it in my other comp it works fine, this is actually the second graphics card ive bought but nothing appears. Any suggestions? could it be the mobo? all fans are spinning and a couple leds are lighting up on it.....
 
You have tried 2 graphics cards? Then it has to be the motherboard. Are you sure that the motherboard is not shorting to the case?
 
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