Power adapter connected to PB G4 , doesn't show connection in the menubar

Battery down to 39% any quick help please connector shows orange light

You could try resetting the Power Management Unit -
To reset the PMU:
1. If the computer is on, turn it off.
2. Reset the power manager by simultaneously pressing and then releasing Shift-Control-Option-Power on the keyboard. Do not press the fn (Function) key while using this combination of keystrokes.
3. Wait 5 seconds.
4. Press the Power button to restart the computer.
Resetting the NVRAM might also help:
1. Shut down the computer.
2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
3. Turn on the computer.
4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
6. Release the keys.
Your system may need to calibrate the battery.
Here are the instructions from Apple:
http://docs.info.apple.com/article.html?artnum=86284

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