Dell Inspiron One 2330 Owner's Manual page 66

Procedure
1 Remove the screw that secures the processor heat-sink to the chassis.
2 In sequential order (indicated on the processor heat-sink), loosen the
captive screws that secure the processor heat-sink to the system board.
3 Peel the portion of the aluminum foil that is adhered over the
processor heat-sink fan.
4 Lift the processor heat-sink off the system board.
1 screw
3 processor heat-sink
66
Processor Heat-Sink
2
1
2 aluminum foil
4 captive screws (4)
3
4