Dell Inspiron 531S Owner's  Manual - Page 152

Replace the computer cover see Replacing the Computer Cover

Page 152 highlights

9 Install the heat sink assembly: a Place the heat sink and fan assembly back onto the heat-sink assembly bracket. b Ensure that the two clamp grips are aligned with the two bracket projections. c Hold the heat sink fan assembly in place and rotate the clamp lever 180 degrees clockwise to secure the heat sink and fan assembly. NOTICE: Ensure that the heat sink assembly is correctly seated and secure. 7 6 1 5 2 4 3 1 clamp lever 4 bracket 7 fan 2 bracket projection 5 heat sink 3 clamp grip 6 fan cover 10 Connect any cables disconnected before removing the heat sink assembly. 11 Replace the computer cover (see "Replacing the Computer Cover" on page 165). 12 Connect your computer and devices to an electrical outlet, and turn them on. 13 Verify that the computer works correctly by running the Dell Diagnostics (see "Dell Diagnostics" on page 84). 152 Removing and Installing Parts

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152
Removing and Installing Parts
9
Install the heat sink assembly:
a
Place the heat sink and fan assembly back onto the heat-sink assembly
bracket.
b
Ensure that the two clamp grips are aligned with the two bracket
projections.
c
Hold the heat sink fan assembly in place and rotate the clamp lever
180 degrees clockwise to secure the heat sink and fan assembly.
NOTICE:
Ensure that the heat sink assembly is correctly seated and secure.
10
Connect any cables disconnected before removing the heat sink assembly.
11
Replace the computer cover (see "Replacing the Computer Cover" on page 165).
12
Connect your computer and devices to an electrical outlet, and turn them on.
13
Verify that the computer works correctly by running the Dell Diagnostics
(see "Dell Diagnostics" on page 84).
1
clamp lever
2
bracket projection
3
clamp grip
4
bracket
5
heat sink
6
fan cover
7
fan
1
2
3
4
7
6
5