Power book G4 won't turn on

So last night I went to plug my charger in and it made a real weird noise then now it won't turn on. Iv had problems with the battery so I'm not sure how to tell if it's the battery that's died or my computer. When I press that button at the back of my computer one green light appears. Thanks

It sounds like your power adaptor may not be working properly, especially since the indicator light doesn't come on. Try the PMU reset that Carolyn linked and see if this makes a difference. Also have a look at this article on troubleshooting power adaptors:
http://support.apple.com/kb/TS1725
It sounds like the battery is fully discharged and not working, but it may be that way because your charger is faulty.
It would be very helpful if you could try a known good battery that is charged, or a known good power adaptor. Do you have access to a friend with the same PowerBook or an Apple Store? If so, see if you can try one or the other or both and see if that cures the problem.
Your Mac should run from a good power adaptor, and it should run from a good battery.  If it still won't boot up, the problem would be with the Mac, and possibly with the board that contains the power port. If it does boot up, then you know that you need a new charger and possibly a new battery.
Good luck!

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