Origineel bericht door: Dan ,
You’ll need to do a bit of testing here to see if you can isolate out the cause. I’m thinking the keyboard switch is failing. If you can turn the system on using the power pads located just above the AirPort board as marked here: [image|1496066] So the next time it fails to start pop the bottom off and carefully short across these two pads you should only need to do a quick touch. If that fails then we need to look a the power rails using a volt meter. Even still you’ll likely need to send your system into someone who has access to the needed parts and tools to do the micro-soldering or you’re talking about a new logic board.