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A possible fix for a Mac that won't power up
Authored by: Mac112 on Apr 11, '05 02:13:06PM

I have rescued dozens of G4's with this symptom by simply unplugging the power cord, removing the battery, counting to 10, reinserting the battery and power cord - and booting.



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A possible fix for a Mac that won't power up
Authored by: lirapd on Apr 11, '05 04:51:59PM

It's a good idea to always check the voltage on the battery because of the discharge curve on Lithium ion batteries. The drop off is rather steep as compared to a alkaline type which drops off gradually. Since the motherboard doesn't draw that much power, simply warming it up will often do the trick (ie. like your remote control for the TV).



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A possible fix for a Mac that won't power up
Authored by: vogunaescht on Apr 12, '05 04:07:52PM

I hope you don't mean warming up the battery. You don't want to warm up a lithium ion battery. Just google what could happen if you do that.



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A possible fix for a Mac that won't power up
Authored by: johnsawyercjs on Apr 14, '05 06:51:45AM

Actually, you want to measure the battery's voltage and its current--lithium batteries (at least the 3.6 volt, 1/2 AA batteries used to power Mac clock/RAM chips) will maintain their rated voltage even after they've practically drained away, but their current level will tell the true story; they won't measure substantially less than their rated voltage until some time after they're no longer useful. What's happened is the battery's chemicals have changed state, to the point where the battery is basically a big resistor and so they can't deliver enough current, though the voltage deceptively still looks OK. Unfortunately, many cheap digital meters don't have a current measuring scale.



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A possible fix for a Mac that won't power up
Authored by: applemandesign on Apr 11, '05 05:27:06PM

i do the same thing, w/o removing the battery. i unplug the pwr cord and click the start button to discharge the pwr supply.



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