How to Upgrade My Computer'S Power Supply

A computer’s power supply generally lasts for the useful life of the unit, but if you update components (especially the video card), you may need to upgrade to a power supply with a higher wattage rating. This how-to article explains the replacement/upgrade process for tower or mini-tower systems, but does not apply to laptops. Generally, replacing a power supply does not subject any static-sensitive components to any shock potential, but using an anti-static wrist band is advised.

Things You'll Need

• Phillips-head screwdriver
• Anti-static wrist strap

Instructions

1. Shut down the computer and unplug the power cord from the back of the tower.

2. Unplug any peripheral cables and lay the tower on its side.

3. Remove the side access panel, being careful not to drop the retaining screws into the tower.

4. Attach the alligator clip of your anti-static wrist band to the metal tower frame and the hook and loop strap to your wrist.

5. Disconnect any connections to the power supply.

6. Remove the four screws that connect the power supply to the tower frame and carefully remove it from the case.

7. Check the listed wattage rating and purchase a power supply that is rated at least that highly. If you are also replacing your video card, check the video card specifications regarding the minimum power-supply rating required. Having a power supply with a higher rating is fine, but one with too low of a wattage could cause system instability.

8. Carefully insert the new power supply into the case and reattach the four connecting screws.

9. Reattach the internal peripheral power cables, making sure that you don’t leave any unplugged.

10. If you have a can of dust spray, blow any accumulated dust out of the case.

11. Disconnect your anti-static wrist strap and replace the side cover on the tower.

12. Reattach any external peripheral cables and plug the power cord into the back of the case.

13. Turn on the computer and enjoy its new, improved performance.

Tips & Warnings

• Always unplug your computer prior to opening the case.