ibook g4 won't run on ac or charge battery

My ibook g4 (1.42ghz) will not run on ac power nor will it charge the battery.

It runs fine on battery power alone. Plugging the ac adapter in has no effect. It doesn't recognize it or stop draining the battery.

Here's what I have done:

Replaced the ac adapter. No change.
Installed a new battery. Runs fine on battery, but doesn't recharge it.
Reset PMU.
Reset PRAM.
Installed a NEW DC-IN Board. No change.
Above resets again. No change.

I've purchased an external battery charger, so at least I can continue to use the computer for as long as the battery remains charged.

Is there a way to hardwire the ac adapter to where the power needs to go, so it will run on ac, but won't be "managed" for charging, etc?

Any other possible fixes short of replacing the logic board, which I believe costs over $250?

Thanks very much.

Nick

Runs better than ever on the battery!

Well, the overwhelming response to this problem tells me something. I did find a thread that suggested shorting out the capacitor to shock the pmu chip back to life.

I think I'll hold off on that, though. The computer is working better than ever on battery power. I think the pmu and pram resets did some good in that department. When I installed the original battery that came with the machine, after charging it in an external charger, it said it had 4+ hours of life in it! Wow!

So I think it's time to leave well enough alone and not push my luck or my computer repair prowess any further!

BTW, I've owned 7 Macs and this is the first one that "broke."

Thanks!

Thanks for your suggestions. I think there were definitely issues in the original power cord, though it never glowed red. I patched together the plug from another ibook with the adapter unit from mine and there was no glowing at all, in any color! I also purchased a new power adapter and cord. No effect.

It's still working well with the externally charged batteries, though noticeably slower because the power management is more aggressive now.

Truth be told, I've gotten my money's worth out of this machine. When I'm as old in people years as it is in computer years, I'll probably need external charging, too.