NO POWER (I have read other posts but still stuck)

Got a problem turning on my G4 "POWER" book 15" Aluminium!
It's the second time I've had a "smoking" power adapter (barrel type) which I thought was annoying enough in itself. Anyway after ordering in my 3rd I discovered that this new power adapter didn't work and another I tried neither.
The green recharge light on the side of the computer does light for about a second on initial plug-in; then turns to orange for a second before going out.
I must unplug at the mains to replicate the light illuminating. Hence I reckon power adapter(s) is working fine as power is obviously getting to computer all-be-it for a second.
Tried resetting PRAM and PMU, but theres just no power to turn the computer on.
Just wondering if anyone else has had the problem and had any solutions?
Possible ideas I have:
DC port (I guess is working because light works even if only for a second)
DC board
Logic board (I hope not)
Something else
I just don't know: please help

Couldn't get hold of an alternative battery to try your idea, but took Powerbook apart.
Tested PRAM battery - seems good reading 3v on the meter
Was hoping to find some burnt board, but nothing. Reassembled laptop and noticed that I got a bit of an intermittent green/orange/charged/charging reading on the power cable, which after a few minutes went out and I couldn't replicate fault.
Decided in wisdom/gamble to replace the DC board (cheaper to buy the part than getting a quote to find out how much it would be to fix).
Its still not booting which I reckon means its the logic board , but I get a regular green light (and power button causes HD to spin). I guess the DC and logic boards fried!?
My question, as I have a bit of weirdness that I don't understand: why does the green light go out when I insert the battery? I get no light whatsoever and the HD doesn't spin-up when I press the power on button. Does the battery somehow complete the circuit? Could this be causing a problem? I thought it should boot/attempt to boot without needing a battery inserted.
Any other ideas before I ebay it or parts?
Thanks in advance

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