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Now that the processor is in place, turn your attention to the heat sink.
Apple uses a thermally conductive film that must be removed prior to reinstalling the heat sink.
Use a razor blade (or anyother flat object such as a credit card, etc.) to remove all of the old solidified thermal material from the heat sink.
Next use a small amount of rubbing alcohol to remove all traces of the old thermal material.
Allow the heat sink to dry before proceeding.
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