Upon review, there is a "hard drive sensor" in this model (though the repair manual contains neither "temp" nor "therm" except for "thermal pad"). You may want to try just unplugging it to see if your machine will start up.

It also recommends against holding the power button in as you plug in the power, but it doesn't explain why -- just that if you are trying to reset the system control manager, that's precisely what you shouldn't do.

On Mar 16, 2010, at 1:16 PM, Jonathon Kuo wrote:

On Mar 15, 2010, at 9:11 PM, steve harley wrote:

try holding the power button as you plug in the power cord; this is the only hardware reset i know of specifically what message did you get that made you feel it was an overtemp shutdown?
sounds possible your motherboard is faulty

Tried holding the power button as I plugged in the power cord. No diff. Just a thought that if there was a bad temp sensor it might have this behavior.

On Mar 16, 2010, at 9:52 AM, George N. White III wrote:

actually the temp sensor itself reporting bogus values (hence things
like fan running at high speed) after a temp spike, but the end result
is all too often system board needing replacement.

I just got back from the "genius bar" and they didn't know what was wrong with it, or even if it had a temp sensor. Their boilerplate answer: a new mobo @ $325.

Guess I have a new doorstop.

--
  Macs R We -- Personal Macintosh Service and Support
    in the Wickenburg and far Northwest Valley Areas.
                            http://macsrwe.com

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