Ibook runs only off battery power

Hello i have an ibook g3 500mhz. one day when i was on my laptop all of a sudden it started making a high pitch noise and stopped and the computer shut off. when i try turning it on with the battery in and charger plugged in it wont turn on. It will only turn on with the battery alone. I also cant plug it in without the battery and only the charger wont let me. so then i bought a new battery still did same thing. then i bought a new charge same old same old. then i bought a dc in board and installed it then resetted the pmu. i dont know what the problem has anyone ever had this problem and know what causing it to do this?

Success! Kinda, it's been unplugged & without battery for a few days, I plugged it in without battery & tried the keyboard combination's and...it booted up!!!
Well I tried putting the battery in and then again it stopped working, removed the battery, power, waited a few minutes, put the power in alone again, nothing.
I think it needs to be switched off without battery for awhile before you can try a PMU reset & at least in my case the ibook needs to be switched on without battery
It's only a matter of time until I unlock a clear solution, clearly the PMU reset directions are....unclear!

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