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/.

don't try to fix it.  just make sure that all the cables in the back of the computer are fastened correctly, unplug the power for both the monitor and the computer.  Then plug them in and try turning them on.  If it works, great, if not, take it to the curb and put a "Free computer" sign on it.

Then go to Dell.com and just buy another one.