Sorry to hear that you are having issues with your notebook
What you describe may suggest that the MB (motherboard) to screen ribbon/cable has become damaged or partially disconnected, this can happen down to nothing more than everyday use such as opening and closing the lid on the notebook, it can however also happen if the lid of the notebook has been opened too wide.
As the notebook is less than 12 months old it should still be covered by a warranty, if it is you should use the warranty to have the notebook repaired and for the following reasons 1: If you try and physically repair the notebook yourself you will void the warranty. 2: Repairing a notebook is complicated and should only be undertaken by a suitably qualified/competent person and 3: You should not be having an issue such as this with a relatively new computer.
As an asides, there is one test that you can do without voiding your warranty and that is connect the notebook up to an external screen by way of the notebooks VGA port, if the problem is not present it points towards the display ribbon/cable, if the issue is present on the external display the problem is most likely the video chip itself.
NB: If you do try the external display test you may need to toggle between screens by using the Fn and one of the F1 to F12 keys or a single key that has a picture of a screen etched on it.
Good luck and let us know how it goes.