Power supply is the most underrated component of the PC. Period. It supplies regulated power to all other components and helps to cool down the system. An unreliable power supply may render even the most expensive of components unstable.

• First, make sure that the voltage of you power supply matches that is supplied in your country. A 220v PSU connected to an 110v source would do no harm, for it just receives half the power. However an 110v PSU connected to a 220v source would actually fry your PSU.




• Disconnect your current PSU from the internal connections. Unscrew the PSU from the back panel and remove it from your CPU.





 

• Place the new PSU and align the screw holes of the PSU with the back of the chassis.


• Insert the screws. Make sure all the screws are inserted and secure.


• Connect the 20 or 24 pin main power connecter to your motherboard. Align the connectors properly before pushing down. Make sure that the connection is secure.

• On some motherboards, there is an ATX12V+12V power connector. Make sure it is properly aligned and connect it.


• After the motherboard is properly connected, connect the PSU to your hard disks, optical drive, floppy disk, graphic card and so on.



• Connect your case fans also. These help to regulate heat and maintain air flow in your CPU.

Go over everything once again. You do not want to miss out any connections and panic later when one of your drives go missing.