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What is white stuff on heat sink?

How can the white substance on the heat sink be renewed/replaced?

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Oh! Thanks! I've used Arctic Silver 5 on the processor core, but it of course isn't white. The white thermal paste on the heat sink sometimes looks chewed up around the edges, not even and new looking; not sure how to accomplish the "new" look, but guess that's not as important as the function!

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Pick up some thermal paste at your local Radio Shack and follow this guide: PowerBook G3 Pismo Heat Sink Replacement

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Good +

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