Okay. Thank you.
This link is for a different cause, but the fix should still work. It sounds as if your flex cable became dislodged.
You need to check both ends of the cable and put them firmly in place. Do this by following the article below:
If that doesnt work, the flex cable may be damaged, or if you do not have enough time, you may be able to get
another computer in time, or turn it back in for a refund when you fix this one if you no longer need the new one.
If it is the cable damaged all together and it needs replaced, i wouldnt discard the laptop.
You can fix it with the document i showed you above by getting the cable for 15 dollars at this link.
(copy/paste link above in your browser)
With luck, (and this is most likely the case) the cable is just loose from the fall.
If you are satisfied with the help I have provided, please remember to click and submit a star rating on this page. Your feedback is important as it is the only way I am credited for assisting you. Thank you.