Macbook Pro Screen not working properly?

I have a 2012 Macbook Pro without retina display. About a month ago some little kid was playing basketball out by the park where I was using it and the basketball bounced off the rim and hit my computer and broke my LCD screen So I brought it to a repair shop saying they could replace it for 250 dollars. Great! now we have another problem. The LCD has been replaced and the computer boots up just fine. But the external display has quit working... I don't know if it's just the LCD screen isn't working or if it's the actually display, the screen is just black... also they hooked it up to an another computer for display but now when it boots up it gets to the home screen, where you would usually click and account to log into, but there are no accounts!! I know they have gotten in just fine before because they called and asked about my files and such that I had open when the accident occurred... Does anyone have any idea what could be wrong with my computer?? I am not willing to pay and pay and pay to try to fix it if they don't know whats wrong.

Welcome to the Apple Support Communities
As those lines changes, I think that the problem is the graphic card, not the display, and in the case of the MacBook Pro, it's not better. The MacBook Pro has got most of its parts soldered into the logic board, including the graphic card, so if one soldered part, as the graphic card, gets damaged, the whole logic board has to be replaced, making the repair very expensive. The only solution is to take the Mac to an Apple Store or reseller

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Click on the link to see more details and screenshots.
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Macbook Pro Screen not working properly?

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