Now the good news is that on many models this is not too expensive and a do it yourself job.
But you didn't supply the laptop's make and FULL MODEL NUMBER so I can't check out what the price is here.
As to the replacement procedure, I find that YouTube often has these tutorials for specific models. Now you can see why posting full model information is best.
I play dota 2 on my 4 years old laptop, after it fell the game became like this https://photos.app.goo.gl/6bTs2N5sLRaPUqwY6
Fyi the display is still functioning, is this a graphic card defect? Thanks in advance.

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