Frozen black screen while trying to install new video card

First off I am new to this so i would like to apologize if this is in the wrong section or if I am doing this wrong in any way.

I have just recently purchased a new video card because the one i had died off. After putting in the new video card and booting up it gets to the black screen with the blinking underscore then goes completely black and doesn't change. I was wondering if someone could help me out with this.

The new video card is a Galaxy GeForce 8400GS. Motherboard is a Foxconn G33M02. I am able to boot in safe mode.
 
re:

If you confirmed that your video card is ok and compatible to youer motherboard, there may some touble about Power consumption. I had meet the same phenomenon and for Power supply shortage.
I'm not in english ,so , i hope you may understand.
 
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