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Model A1181: 1.83, 2, 2.1, 2.13, 2.16, 2.2, or 2.4 GHz Core 2 Duo processor

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Could a faulty heat sink cause freezing/unresponsiveness?

I hear a silent click every few seconds and I get the pinwheel+unresponsive program very frequently (nearly every use), especially when dealing with audio, video, and web browsing. When not lagging like this, the computer performs very smoothly. Upon taking the machine apart, I noticed the copper on the heat sink was charred, as if it had significantly overheated, possibly from my recent Age of Empires bender?

I've swapped out my ram, hard drive, and even installed a clean OS with no change. Is it possible that the heat sink is the culprit?

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When the Processor overheats it throttles its speed which can cause the lag you are experiencing.

You might be able to fix it by applying new thermal paste and cleaning out any dust.

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Follow the guide mayer posted and reapply thermal paste

This guide should help you with the thermal paste How to Apply Thermal Paste

I believe you can buy good thermal paste from the ifixit store

also check your fan is running you may need a new fan

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