2.26 or 2.4 GHz / White plastic unibody enclosure

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The MacBook does not switch on again

On my late 2008 MBP 15'' I just changed the hard drive and since the fans were dusty, cleaned them a bit with a vacuum cleaner - WITHOUT disconnecting the fan connectors first. They were of course spinning up for short times. Now the macbook does not switch on again and I am wondering if the spinning up of the fans could have induced currents via their electric motors that might have created some over-voltages? Is this a plausible scenario and reason for the MB not starting at all and if yes, any idea how to test it? any help most appreciated!

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Vacuums are very dangerous! They create static electricity which can zap the sensitive chips inside when you tried cleaning the fan.

The correct way is to use a soft brush to scrub the fan blade surfaces to loosen the dust and then us a short blast of can'ed air to blow away the junk.

Sadly, at this point I suspect you have damaged your logic board.

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Thanks very much for the answer. Are there some ways to check this? Also for my education: could you tell me where the static electricity is created? The actual motor is far away, the tube close to the sucking end is made of non-conductive plastic. Is the static electricity maybe created via air-vortexes?

It's not new any more (late 2008 model) but I might probably be able to find a second hand logic board for a decent price I assume. It would however be good to be able to check that it is indeed the logic board that is gone.


Take a look at this: How Van de Graaff Generators Work. Basically your vacuum creates a charge when the air is being sucked through the hose (the moving air's friction). Most of your end pieces are conductive (nozzle end) so it can discharge the buildup even the plastic. The ones that aren't will have hair or other stuff clinging to it. They do make special vacuum units but they are very expensive.


You could try disconnecting the HD and fans to see what you changed out didn't alter things. Other than that its not easy to diagnose a blown board at the component level without some special tools. Getting a (good) used logic board is a good start. Sorry for the bad news ;-{


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