Lift the lever on the CPU socket.

When the processor is in its socket, push the lever back down.

First, insert the CPU in its socket. To do this, raise the small lever at the side of the socket. If you examine the CPU from underneath, you will notice that there is a pin missing at one corner. Match this corner with the corner on the socket where there is a hole missing. The processor is keyed in this way to make sure it is inserted correctly. Please bear in mind that you should not force the CPU when inserting it! All pins should slide smoothly into the socket. If you are sure that you have positioned the CPU correctly (using the missing pin as reference), yet are unable to insert the CPU, it is likely that one of its pins is bent. If this has happened, straighten the pin using tweezers or a screwdriver. Once you have installed the processor, lock the lever back down.