No batteries available message in Leopard

Question

Since I installed Leopard on my PowerBook G4, I'm having real weird battery reporting issues.
An "X" in the battery icon in the bar at the top of the screen. When I click on it, it says "No batteries available"...even though the battery is still in there and working!
Even with the power plugged in and the light is green on the edge of the power connector, the icon doesn't show that it is running off of AC power.
I click the button on the bottom of the battery, and it only lights up 3 of the 5 lights (which if it's fully charged, all 5 lights should be lit up).
Here is what the System Power Settings show in "About My Mac..."
AC Power:
System Sleep Timer (Minutes): 0
Disk Sleep Timer (Minutes): 0
Display Sleep Timer (Minutes): 0
Dynamic Power Step: Yes
Reduce Processor Speed: No
Automatic Restart On Power Loss: No
Wake On AC Change: No
Wake On Clamshell Open: Yes
Wake On LAN: Yes
Wake On Modem Ring: Yes
Display Sleep Uses Dim: No
Battery Power:
System Sleep Timer (Minutes): 0
Disk Sleep Timer (Minutes): 0
Display Sleep Timer (Minutes): 0
Dynamic Power Step: Yes
Reduce Processor Speed: No
Automatic Restart On Power Loss: No
Wake On AC Change: No
Wake On Clamshell Open: Yes
Wake On Modem Ring: No
Display Sleep Uses Dim: No
Reduce Brightness: No
Hardware Configuration:
Clamshell Closed: No
UPS Installed: No
AC Charger Information:
AC Charger (Watts): 65
Connected: Yes
Charging: No
Battery Information:
Charge Information:
Charge remaining (mAh): 0
Charging: No
Full charge capacity (mAh): 10000
Health Information:
Cycle count: 0
Battery Installed: No
Amperage (mA): 0
Voltage (mV): 0
Can anyone help? What is going on??

Answer 1

Hi everyone, I think I just solved my own problem...here's what I did.
1. I reset the PMU. With the power off, hold down shift-control-option-power for 2-3 seconds, then let it sit for at least 5 seconds.
2. Reset the PRAM & NVRAM. Turn the computer back off, back on, and press Command-Option-P-R before the grey screen appears (it should cause the computer to restart and "bong" again)
3. In the the system root Library folder, go into /Library/Preferences/SystemConfiguration and delete the com.apple.PowerManagement.plist file. To be safe, you can copy it to the desktop and then delete the file. Then restart your computer.
After I did all these things, the battery went back to functioning properly. We'll see if it continues to work!
Hope this helps someone!
David