Dell Inspiron 535 (Early 2009) - Manual (Page 41)

Compare the system board that you just removed with the replacement system board to ensure that they are identical.
Replacing the System Board
1. Gently align the board into the chassis and slide it towards the back of the computer.
Inspiron 535/537
Inspiron 545/546
2. Replace the screws that secure the system board to the chassis.
3. Replace the cables that you removed from the system board.
4. Replace the processor (see Replacing the Processor ).
5. Replace the processor fan and the heat sink assembly (see Replacing the Processor Fan and Heat Sink Assembly ).
1 screws (8) 2 system board
CAUTION: Ensure that the port retention springs are not damaged while replacing the sytem board.
1 back of the computer 2 port retention spring
1 back of the computer 2 port retention springs (3)
CAUTION: Ensure that the processor fan and heat sink assembly is correctly seated and secure.