Upgrading any central processing unit (CPU) can be a complicated process. The CPU chip can suffer serious damage during the disassembly process if you don't know what you're doing. The procedure to replace the HP dc7700 desktop's processor requires minimal disassembly. Most HP dc7700 desktop computers use Intel Pentium D processors. HP dc7700's can run processors with speeds ranging from 2.6 to 3.4 GHz.
Shut down the computer using the operating system. Disconnect the power cable from its socket on the computer's back panel. Disconnect any external devices from the computer.
Rotate the computer tower until the back panel is facing toward you. Place the computer horizontally on its left side. Grasp the lever on the right side panel. Pull up on the lever. Pull the side panel away from the computer to reveal its internal contents.
Locate the heat sink near the centre of the motherboard assembly. The heat sink is the large metal device protruding from the motherboard that covers the processor chip. Disconnect the heat sink's power cable from the motherboard. Remove the four Phillips screws that secure the heat sink in place. Remove the heat sink.
Lift straight up on the lever securing the processor in place. Rotate the processor's metal cover away from the chip. Lift the processor out of its socket, and set it aside.
Reverse this procedure to install the new processor chip. Apply a thin coat of thermal grease to the surface of the processor before replacing the heat sink. This procedure will prevent the processor from frying when you turn on the computer.
Use an anti-static wrist strap to prevent serious electrical damage to the motherboard during the disassembly process.