How to Fix Computer Overheating Caused by Blocked Heat Sink

Step-by-Step Guide

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   Step 1: Unplug your computer before opening the case.

   Wear a static wrist guard if possible, or touch the metal case before handling anything inside, to ground any static charge you may have.
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   Step 2: Consider other options first.

   Overheating issues are also often caused by poor air circulation in the computer case.
   
   If you have space, adding another fan can help.
   
   Also, you should regularly open the case unplug all the cords and carefully take your computer system outside use a can of compressed air or an air compressor.
   
   A small vacuum is a good second choice but you have to be careful not to hit any internal components with it, and avoid touching the circuit boards with anything.
   
   Take your time and be very thorough with this step.
   
   Next take a cotton swab dabbed in some rubbing alcohol and go over the internal case components to get them very clean.
   
   You can go over the external case with a rag and a little bit of water.
   
   Allow your system 2 hours to dry out before turning it back on. , Grasp the plastic end and pull carefully until it comes out.
   
   Don't pull it by the wires. , It may be held in place on the motherboard by four Phillips screws or a lock-down lever. , Often it is held in place by a small lever that lifts to release the processor. , Dropping the processor will likely damage it.
   
   Alternatively, it may be stuck to the heat sink by thermal paste.
   
   Try to separate them.
   
   A credit card-type card can be useful for this step, but don't damage the CPU trying to pry them apart. , Blast compressed air directly on the heat sink.
   
   It only takes a few good quirts to clean a blockage.
   
   If it's persistent, allow a few seconds before repeating. , Use a clean cotton bud or paper towel.
   
   A little rubbing alcohol may help, but too much could cause damage. ,, It only takes a small amount.
   
   Too much can cause overheating problems all over again. , Clip the clip back in.
   
   Secure the fan back on.
   
   Plug it back into the motherboard. , Make sure stray wires are secured away from fans, then put the cover back in place. ,
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   Step 3: Remove the small CPU fan plug from the motherboard.

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   Step 4: Remove the CPU cooling fan.

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   Step 5: Release the CPU.

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   Step 6: Take care not to drop the processor or pull it off if it's stuck.

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   Step 7: Clean out the heat sink.

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   Step 8: Carefully wipe off any residual thermal paste.

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   Step 9: Replace the CPU in its socket.

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    Step 10: Apply a thin layer of thermal paste to the top of the CPU.

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    Step 11: Replace the heat sink.

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    Step 12: Tidy up the case.

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    Step 13: Test your computer to make sure everything works.

Detailed Guide

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