Screen Not Working But Starts

Hello Guys. I appreciated the solution you suggested. But it didn't work on me. I did all the possible solutions(getting off the power cord and battery then pressing 1-2 mins; doing the ram thing) but the laptop' screen is just black and empty. I am very nervous because I am using my cousin's laptop and I don't want to tell him that his laptop gets damage because of me. Please what will I do now. I also try to open the laptop. Can you please tell me what to do when I open the laptop? By the way the laptop's model is Satellite. Please help me guys I'm really nervous. Thanks. What will I do?