Powerbook G4 1.67 15" won't boot

Hi,
My A1106 Powerbook G4 15" is not starting up. The symptoms are a combination of power problems and logic board problems symptoms.
Specifically:
1)By pressing the power button, the fans begin to work but there is no startup sound or beeps and the screen is black.
2)If I connect the power adaptor with the battery inside, the light on the connector of the adaptor becomes green, and after a few seconds becomes amber and after 1 or 2 seconds it turns off completely. Then I have to unplug/replug the adaptor (from the power socket) in order for the light to become green again and then the same things happen.
I tried with another battery and the same thing happens.
3) If I connect the power adaptor without the battery, the light is green and it remains green. The machines responds to the power button and exhibits the behavior described in 1).
I tried to:
1)Reset the PMU
2)Take out the memory modules and reset the PMU
3)Take out memory modules, hard disk and reset the PMU.
Nothing happens. It is always as symptom no1.
I am searching ebay for a logic board but I want to be 100% sure that with a new board the powerbook will be fixed.
Is there any other possible part that can be the problem? I would hate to buy a new logic board only to find out that the original board wasn't the problem.
Sending it to Apple is not an option (way too expensive).
So, are the above symptoms explained by a faulty logic board? Should I buy a new one? Is there anything else I could try?
Thanks

Hi, polokov. Have you tried a different AC adapter, or tested your adapter for proper operation with a different Powerbook? An AC adapter is a whole lot less expensive and easier to replace than a logic board, if that's where the problem lies.
The other possibility apart from the logic board is the DC-In card in the Powerbook, which is also a lot cheaper than a LB. An adapter plug that doesn't light up or doesn't stay lit is often a symptom of a bad DC-In card.
I would test the adapter to be sure it's not to blame, then replace the DC-In card, before concluding that the logic board is at fault. And if I were shopping for logic boards on Ebay, I'd only consider the offerings of top-rated vendors who offer real warranties on the boards they sell. A used logic board isn't something you should buy without a meaningful warranty.

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