Yo dude.
If you are new to repairing hardware check out a local I.T store for a solution. If you want to adventure yourself you should open it and take a look to the flat cable that connects the monitor to the motherboard. Make sure it is not damaged. Put some '''''Isopropyl alcohol''''' to clean the contact. If that doesn’t help i think it is better for you to see an it tech.
See ya