Computer Hardware:
     • Tools, Static & Cleaning
     • Form Factor
     • PC Case & Fans
     • Motherboard
     • Processor (CPU)
     • Power Supply Unit
     • RAM
     • Hard Drive
     • Solid State Drive
     • Optical Drive
     • Floppy Disk Drive
     • Graphics Card
     • Sound Card
     • Network Card
     • Computer Monitor
     • Keyboard & Mouse
     • Laptop / Netbook
     • Building a Computer
     • Overclocking

Operating System & Backup:
     • Operating System
     • Drivers
     • Windows Tools
     • User Accounts
     • Backup
     • Windows 10

Internet & Network:
     • Internet
     • Wi-fi or Cable
     • Improve Broadband Speed
     • Network Computers

Computer Peripherals:
     • Printer
     • Scanner
     • External Hard Drive
     • USB Flash Drive

Computer Security:
     • Anti-virus
     • Anti-Spyware
     • Phishing
     • Firewall

Common PC Problems:
     • Slow Computer
     • Hardware Failure
     • Software Failure
     • Printing Problems

     • Windows Shortcuts
     • Glossary of Terms
     • HTML Colour Picker
     • Number Base Converter

PSU Upgrade

When you have purchased your new Power Supply Unit, which should have a sufficient wattage and all the correct connectors, then you are ready to install it into your desktop computer.

Upgrading your desktop computer Power Supply Unit
1. Back-up all of your important files.

2. Make sure the power is unplugged and press the power button to drain any power from the computer.

3. Follow anti-static procedures, and have your tools at hand. Open the computer case.

4. Firstly, the old Power Supply Unit has to be removed.

5. Remove the computer cover and locate the motherboard power connectors. There should be a 20 or 24 pin main ATX power connector and you can pull it out of the motherboard by squeezing the clip on the connector. Also remove the 4 pin ATX +12v connector from the motherboard.

6. Next, remove the power connectors from all the drives and also from the graphics card if applicable.

7. The Power Supply Unit will usually be held in place by four screws at the back of the case. The old Power Supply Unit should now be removed. Some computer cases require you to remove the top of the case to access the PSU.

Screwing the new Power Supply Unit into place.
Securing the PSU using four screws.

8. Fit the new Power Supply Unit in place of the old one using the four screws.

9. Neatly, bring the wires into the computer and firstly plug in the 20 or 24 pin main ATX power connector into the motherboard. It is keyed and will fit only one way.

Connecting 24 pin main ATX power connector and Hard Drive connector.
Connecting 24 pin main ATX power connector and SATA Hard Drive connector.

10. Next, connect the 4 pin ATX +12v connector into the motherboard.

11. You can now plug the power connectors into the drives and if necessary into the graphics card.

12. Once all the wires are connected then you need to make them as tidy as possible and keep them well away from any moving fans. You can use cable ties to tie the wires back safely so they will not inhibit the air flow around the computer.

13. Replace the computer cover, connect the power cable, Monitor, Keyboard, and Mouse and then power up the computer to see if it all works okay.

If after Upgrading the PSU and booting the computer it beeps then switch off and check all your connections.

Once the computer boots up okay then it is a good idea to run a demanding 3D game or a benchmarking program for an hour or so to make sure the PSU handles it okay. Also make sure the PSU fan runs properly and the computer does not get too hot.

1. PSU 2. PSU Connectors 3. PSU Upgrade
4. PSU Wiring & Testing