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2   How to Install and Replace Components In Your Desktop PC
Replacing the Power Supply
6 Insert the new power supply (lining up the metal catches). 
7 Replace the four screws to secure the power supply. 
8 Re-install the hard drive tray (described in this chapter).
9 Reconnect all internal power supply connectors.
10 Replace the cover (described in this chapter).
11 Select the correct voltage setting for your country.