Computer wont start!

hey all,
I was using my computer running on battery when the battery went empty and computer turned off. so i plugged the computer to the AC and used it. when the green light turned on and the status on screen said fully charged, i unplugged the electricity but the computer turned off right away!
i tried to start the computer, the white light flashed for one second, the computer tried to start but turned off right away.
the green light on the electric cable is still on, the meter on the battery it self shows that the battery is full. the mac os meter says "battery is charged" and windows meter also shows full battery, but once i remove the cable, the computer shuts down!
Whats the problem?
the computer is old, but the battery was very good and working as new with very long hours in it. but no warranty on the computer now.

Check and see if you have battery update 1.3 installed. You should find it at the location listed. Right click on the bundle and check *Get Info* a window will open and you can check the version there.
MacBook/System/Library/SystemConfiguration/BatteryUpdater.bundle
Leopard(10.5.1) and Tiger(10.4.11) installs it. It is the MacBook Pro update.
If it is 1.3 drag it to the trash and then reboot. After you reboot you will be able to empty the trash. Once you have done that run software update and it should install Battery Update 1.2. You should reset the SMC (System Management Controller) after doing this.
This should not be done on (Late 2007) or newer MacBooks.

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Quote from: Eirik87 on 10-December-06, 00:53:31
Hello.
First of all, I'am from Norway so my english is perhaps not that impressive :P
I recently decided to upgrade my computer a bit and for now, these are the parts that are installed (only the nessecary parts for a startup is installed for now. Installing the rest as I see things are working) :
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