First you will need to know what kind of socket you have on your motherboard, so you can purchase the correct CPU for your replacement. Intel and AMD have lots of different socket sizes so don't overlook this point. If you have the CPU that you are going to replace, all you need is a screwdriver, thermal paste, and CPU fan.
1) Open the case cover with screwdriver, and open side panel to locate CPU.
2) Using a screwdriver or sometimes just release clamps to take off the CPU fan.
3) Release lever on the side of the socket to release the CPU.
4) Pull out old CPU and install new CPU, (Be very careful not to bend the pins on the CPU.)
5) Put small amount of thermal paste on top CPU.
6) Replace CPU fan and connect power to the fan, replace cover.
Now in a perfect world this should be it, but if you upgraded you CPU you should go into you BIOS and check the settings for your CPU. To make sure the voltage is correct.
Look here if you need more help.
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