Lenovo IdeaCentre B500 - Manual (Page 45)

Chapter 8. Replacing hardware
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6. Holding the microprocessor with your fingers, remove the protective
cover that protects the gold contacts on the new microprocessor .
7. Holding the microprocessor with your fingers, position the
microprocessor so that the notches on the microprocessor are aligned
with the tabs in the microprocessor socket.
Important
To avoid damaging the microprocessor contacts, do not tilt the
microprocessor when installing it into the socket.
8. Lower the microprocessor straight down into its socket on the
motherboard.