This happened to me. When i bought my computer, it had a video card build in. When i got a new one, the screen went black etc. because the computer was trying to load both cards. If your computer has a video card built into the motherboard at all, that may be your problem.
Weather thats the problem or not, You need to start the computer in safe mode. When you first start it up you have a few precious seconds to hit F2 before the screen will go black, you gotta hit it when the blinking dash is up in the corner. After that it lists some stuff, play around with that and you can eventually log in your account in safe mode. Now the screen is screwed up and you need to go to your computers properties and fix whatever is wrong from there, (disabling the old card etc.)
Now if the screen goes black before the dash, your screwed.
Or your computer takes PCE cards.... But then it wouldnt fit would it...
...yeah