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Macbook model A118 System powers up, startup sound plays, Apple logo appears, the throbber appears, system fan starts to race, system shuts-down. IMHO this looks heat related i.e. the CPU Fan is racing, but thats the only outward sign. Anyone else see this problem or concur with the diagnoses?

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Quite common in all pc's. You can check the fan yourself. Disconnect all power sources including battery.

You'll need to earth yourself to prevent static discharge. (Loose copper wire, one end round your wrist the other attached to a radiator or water pipe)

Take any plates off the bottom of the laptop you can and clean our all the dust and fluff that's accumulated especially around the CPU and Fan area making sure all vents are clear.

If that doesn't work, you have to go a little further.

You'll need to purchase some heat sync compound/paste.

Remove the CPU fan and Heat dispersal plate.

You will probably see some dried up goo, that's the old heat sync paste, its been cooked. Clean it off the CPU and the heat dispersal plate, spread the paste on both the cpu and the heat dispersal plate to form a good interface and re-assemble.

For cleaning I use isoproprial alcohol, is softens without soaking and evaporates fairly quickly; and a soft lint free cloth.

Before you start have a look on You-Tube, it has loads of videos which will show you how to do it.

Posted on May 04, 2010

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Apple’s solution to this is to realign the location of the thermometer and cabling on the heatsink so that it does not short circuit. That is why the new heatsink is necessary. In the view of this writer, it warrants a public recall. Any user can produce easily the scenario that causes the MacBook to crash, even with pre-installed applications such as iLife.

My 2 cents,

Thanks

Fame !

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