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Lesson 9: Power cable installation - Build my own computer

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In lesson 9 we'll continue the process to build my own computer and install the power supply into the case. Then we'll connect the power cables to the motherboard and disc drives.

Installing the Power Supply into the case 

On some cases the power supply is installed at the top of the case above the motherboard. On these cases you should turn the power supply so the air intake is at the bottom. In this case the power supply goes below the motherboard at the bottom of the case. With bottom mounted power supplies you should turn it so the air intake faces upward. However if the case is vented at the bottom you can turn the power supply over so it can get cool air from the outside of the case.

The power supply is secured to the case with 4 screws. Hold the power supply in place and match up the power supplies screw holes with the holes on the case.

Insert the first screw at the top and the second, at the opposite, bottom corner. Leave them loose until all the screws are in and then tighten them down.

Check the power supply for a slider next to the primary power switch. If it has a slider, set it to 115V or 230V depending on your local power requirements. 115V is standard for the US. Most modern power supplies don't have a switch and detect the voltage automatically.

Wait to connect the power supply to the outlet until the computer is fully put together.

There are 6 types of connectors on an ATX12V 2.3 or EPS12V 2.91 power supply.

  • The first is a 24 pin connector that provides the main source of power to the motherboard.
    Some power supplies come with a 20 plus 4 pin connector and you can remove 4 of the pins by breaking them off incase your motherboard only needs the 20 pins.
  • The second is a 4 or 8 pin plug that connects to the motherboard. Some power supplies come with 2 4 pin plugs that you can combine to create an 8 pin plug.
  • The 3rd is a 4 pin plug, also called Molex, which connects to some fans, hard drives, DVD and Blu-ray drives.
  • 4th is a smaller 4 pin plug used to power a floppy drive.
  • 5th a flat SATA power connector for SATA drives
  • 6th a 6 or 6 plus 2 pin PCI Express video card power connector. 
    Not all video cards require a connection to the power supply.
    Most video cards that do require the 6 or 6 plus 2 pin connectors will come with a 4 pin molex to 6 or 6 plus 2 pin adapter.

All of the power plugs are keyed, so you can’t put them in upside down.

Modular Power Supplies

If you have a modular power supply, decide which of the cables you will need and save the rest for future use.  Read the manual for the power supply to make sure you plug the cables into the correct spots on the power supply. 

Molex connections

We don’t have any drives or fans that take a 4 pin molex connection in this build.  If you need to use a molex cable the connection is keyed so it will only go in one way. It sometimes takes some extra pressure.

Connecting power cables to the components

We’ll connect the three fans that came pre-installed in the case to the 3 pin fan headers on the motherboard.

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$1200 Computer

Tech Specs
Intel Core i5 4670K 3.4GHz
8GB DDR3 Memory
1TB Hard Drive
Geforce GTX 650 Ti Video card
24X DVD Burner
Creative X-Fi Sound card
23" Widescreen Monitor
Logitech Z623 Speakers
Logitech G9x Mouse
Logitech G510 Keyboard

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$2300 Computer

Tech Specs
Intel Core i7 4930K Six Core 3.4GHz
16GB DDR3 Memory
1TB Hard Drive
128GB OCZ Vertex 4
XFX Radeon HD 7990 6GB Video cards
24X DVD Burner
Creative X-Fi Platinum Sound card
23" Widescreen Monitor
Logitech Z-5500 Speakers
Logitech G9x Mouse
Logitech G510 Keyboard

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"I just built my very first PC and I could not have done it without your tutorial.  I learned so much about what to do and not do, what to look for and what to avoid.
Your tutorial is very thorough, precise, detailed and easy to understand.
My PC is up and running very well and it is all thanks to your video. 

Check out the computer I built!
Thanks again!
Norman Lao

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