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A possible fix for a Mac that won't power up
Resetting the Power Manager for a none starting Mac is a standard procedure and is fully documented on apple knowledgebase. I not sure why it appears as a hint on this in 2005. When Mac users have been using the technique for years.
A possible fix for a Mac that won't power up
As well as keep your machine from ever booting again without replacing the logic board...
A possible fix for a Mac that won't power up
I don't know where the myth came from that suggests if you crash your PMU you need to replace your logic board but it's not true.
A possible fix for a Mac that won't power up
I have had a number of clients with un-revivable logic boards who've told me that before bringing their machines in for service, someone they knew told them to either hit the PMU reset button several times in a row or even to hold it down for thirty seconds or more. Granted, this is just a correlation and not a proven cause and effect - more likely these folks may have just had an ESD incident while they were dinking around inside their machines or the MLBs had already failed in some other way - but why take chances? If a little fear causes people to be conservative and extra careful when messing around with a part that's US$300-500 to replace, that's less harmful misinformation than the many and varied PMU reset procedures that get propagated here and other places on the web. BTW, thanks for posting the official procedure. |
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