Black Screen Boot MacBook 13.3"

[MacFreakieDee]

My MB fell and the screen cracked on the right corner. The screen still worked in the other areas. It cracked because when it fell on carpet it was open and hit the leg on my chair (barf, lol). I replaced the screen with a new one. About a week later no video or signal was going to the screen. It would boot but nothing but a black screen. The sleeping light will remain white and on.

I have tried resetting the PRAM, SMU and even booting from OS X disks, no video. It works when connected to a external monitor just fine.

I was wondering is there any other ways to get the screen to work or test the video card on the logic board? What does a repair like this cost?

Thanks,
MFD