If it is dead then remove the hard drive and connect via USB adapter to another Mac in order to retreive your data.
Troubleshooting portables that won't turn on or start up
Troubleshooting: My computer won't turn on
Thanks to you both. Yes, dalstott - that was going to be my last option if couldn't get the computer itself kicked into life.
I should also have said, Texas Mac Man that I have seen those articles before posting. Unfortunately without a solution.
Oh well, the laptop had a good innings... RIP...?
If the battery is removed (but the computer is connected to the power supply) then nothing happens...
Not an uncommon PowerBook occurence. I get the same thing with my PBG4 and am convinced it's a symptom of a dead internal backup battery.
These backup batteries are hard to find new and require a fairly major teardown to replace. It's best to keep the main battery in place with some charge on it.