The screws that hold the CPU heat sink in place are attached to the heat sink with springs and washers. They should only be loosened enough to detach the heat sink. Do not try to remove the screws from the heat sink itself.

Locate the four Phillips #1 screws securing the heatsink over the CPU.

Remove the screws securing the heat sink with a Phillips #1 screwdriver.

Lift the heat sink off of the CPU upwards with your fingers.