CAUTION: Using excess thermal grease can cause grease to contact the 
processor shield, which can cause contamination of the processor socket. 
8  Place the heat sink on the processor. See Figure 3-11. 
9  Using a Phillips screwdriver, tighten the heat-sink retention screws. See 
Figure 3-11. 
10  Replace the system-board assembly. See "Installing a System-Board 
Assembly" on page 143. 
11  Reconnect the system to its electrical outlet and turn on the system, 
including any attached peripherals. 
12  Press <F2> to enter the System Setup program, and check that the 
processor information matches the new system configuration. See 
"System Setup Options at Boot" on page 58.