Dell XPS 410 Service Manual page 43

1 release tab
4 heat sink captive screws (2)
5. Use a long Phillips screwdriver to loosen the two captive screws, one on each side of the heat-sink assembly.
CAUTION: The heat-sink assembly may be very hot during normal operation. Be sure that it has had sufficient time to cool before you touch it.
6. Rotate the heat-sink assembly towards the rear of the computer, and remove it from the computer.
1 heat sink and fan shroud assembly
7. Place the heat-sink assembly on its side in a safe place.
8. Disconnect the system fan cable from the system board.
9. Ensure that all cables have been removed from the routing clips on the top of the system fan assembly.
2 card retention mechanism 3 card retention door
2 captive screw housing (2)