Ibook g4 cant turn on with charger, but works fine with battery

i have a ibook g4 cant turn on with charger.
using battery, ibook works fine-----so not the battery problem
charger works fine on other ibook-----so not the charger problem
the DC-in board works fine on other ibook-----so not the DC-in problem
reset the PMU----no work.
when the battery is on ibook, plug in the charger, light is green, but will not charge the battery. in OS X it shows running on battery. if run out off battery, will turn off.
if took off the battery, and plug the charger, cant turn on; and light is dark.
any idea?
PMU chip is broken? how can i change the PMU?
thanks a lot

you are holding Shift-Control-Option-Power correct?
To replace the PMU requires a new / refurb logic board.

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I would start by powering down the Apple device, make sure that you hold the power button down, and slide the bar on the screen to "Off". If you have more that 1 iOS device that you use with the printer (like another iPad or an iPhone) power them down at the same time. Then turn them all back on and try to print to the printer.
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Ibook g4 cant turn on with charger, but works fine with battery

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