General procedure for CPU Installation

1. Turn off the computer and unplug the power cord.
2. Disconnect external devices (AC power and monitor power).
3. Follow the appropriate ESD safety procedures.
4. Remove the cover of the computer.
5. Locate the socket for the CPU. It could be on the motherboard or on a removable processor card.
6. Remove the old processor. This may require special tools for older processors. Pentium II and III packages are Slot 1 designs, which slide into a slot much like those used for an expansion card. The original Pentiums (60–166 MHz) and Pentium Pro models usually have a ZIF (zero-insertion-force) socket. Open the ZIF socket by moving the handle to the upright position. (This should not require force.) The CPU can then be easily removed.
7. Install the new processor. Be certain to align the chip properly (this is critical!). Pin 1 on the CPU must fit pin 1 in the socket. There are several ways to identify this pin. Various chip manufacturers, and different versions of a manufacturer's chips, use different methods to mark installation orientation. Slot 1 CPU packages, for example, have a key in the slot, and it fits only one way. Other CPUs have similar schemes appropriate to their socket design. Look for a key pinhole in one corner, a blunt edge on one corner of the socket, a dot, a corner with a pin arrangement that differs from the others, or some other identifying mark. Align this mark with the corner of the socket that contains a blunt edge. If you encounter any resistance or you have to apply any pressure when inserting the CPU, recheck the chip's orientation and alignment, and reinsert the chip. After the chip is in place, secure the ZIF handle, as applicable. You might need to check the documentation to make sure the chip is installed correctly.
8. Set any jumpers or switches on the motherboard. Check the documentation.
9. Replace the cover and power up the computer.
10. Reconnect any peripherals (keyboard, mouse, monitor). Make changes to the CMOS (complementary metal-oxide semiconductor) setup, if required.

Some CPU upgrades also require the installation of a new voltage regulator and cooling fan. Be sure to check the motherboard and CPU documentation for this possibility. Failure to install these parts with the new CPU might destroy it.

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