Is my graphic card not getting enough power? (black screen)

[MosesFPS]

I'm using 500 watt psu it said on the website 70 % efficiency. please help

 

[barto]

What PSU do you have? (make and model)

 

[MosesFPS]

What PSU do you have? (make and model)

Win power psu

 

[barto]

I'm assuming you have this power supply: http://www.newegg.com/Product/Product.aspx?Item=N82E16817148038

What does the rest of your build look like?

 

[bobforapples]

Can't answer without knowing what graphics you're using.

 

[MosesFPS]

Can't answer without knowing what graphics you're using.

FX 4100
HD 7870
8 GB RAM
Win power 500 Watt PSU