Work, Work, Work!

I went into the classroom and noticed lights 3 and 4 were lit up on the computer. I then went back to the classroom and researched it for a few minutes and it said that if there was more than one memory module I needed to take them out and try them one at a time to see which one was faulty. So then I went back to the computer and took it apart and found that it had one memory card. So I put it in a different slot and put everything back together. The computer turned on and I logged in and out.