I would suggest you to follow the below mentioned steps which could fix the issue:
• Verify that the BIOS and Video drivers are the latest.
• Connect to an external monitor (if available), when the external monitor does work it may be an issue with the Operating System. Verify that all the drivers are the latest.
• Check if the horizontal lines appear in the System Setup (BIOS).
• Run LCD diagnostics.
Please reply if you have any further questions.
Thanks & Regards