Powerbook starts up. then shuts down after a few seconds

Help!
My powerbook starts fine boots the system. gets as
far as when the system shows the right hand dropdown
menus then blacks out. some times the screen flickers
first. It then will not start again unless I reset
the PMU. then It starts fine only to repeat the
problem.
I have tried it with another adapter, and its the
same.
I've tried several PMU resets, and pram reset.
unplugged it for several hours with he battery out
programmmers button etc. But the problem persists.
Any suggestions at all are welcome
further to my first description, the powerbook will run start up of the battery the go to permanent sleep after a few minutes.
also and wierdly, its will run ok with the power plugged in for as long as the battery charge lasts. Then it does something similar to sleep. but without thesleep light.
I'm am really scratching my head here.
Any feedback would be gratefully recieved

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Powerbook starts up. then shuts down after a few seconds

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