I need help with my computer.

Look I know jack shit about computers so please explain this to me as simply as possible. Now, A few weeks ago my computer stopped working and I don’t know how to fix it. You see the power button light on the CPU is green and the monitor button light is yellow, but when I press the monitor button it won’t turn green. I remember this happened once before when the CPU was tilted slightly, but I just unplugged it and plugged it back in then it worked. So please help, also tell me if this should be in /r/.

Also I have a lot of music saved on to my computer so my dad was going to take the CPU to his work to have them copy all the files on there and put them on another CPu. Well I have a folder on there that has porn on it and I don't want him to know about it.