iMac G5, 17-inch Troubleshooting - 39
Symptom Charts
Heatsink Cleaning Procedure
Dust drawn in through the intake grill on the bottom of the iMac can gradually accumulate,
eventually degrading the cooling performance of the heatsink by obstructing the air flow.
1. Before you begin, remove the back cover and the midplane assembly.
2. Remove the lower fan from it’s mounting bracket to expose the heatsink cooling fins.
Note: The lower fan does not need to be disconnected from the logic board.
3. With the lower fan removed, carefully inspect the heatsink intake for visible dust
contamination as shown below. If the heatsink appears free of dust then reinstall the
lower fan, assemble the system, and retest the computer. If there is visible dust,
proceed to the next step.