Take a look at the back of your computer, you will see a cable connecting the CPU with the monitor and a second cable connecting the computer to the electric socket.
Your computer might also have a cable linking it to the internet, unless you have a wireless system.
If you get confused with the wiring system of your computer then you can consult with some good cabling professional. Normally the cables required for the wiring of the computer are Ethernet Cable, Cat5e Cable, Network Cable etc.
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