Shuts down as soon as unplugged but battery charged 100%... please help

My MacBook will now shut down as soon as the power cable is unplugged. I've done all of the Software Updates so should be right up to date.
Mystery is it did start to shut down when it was in sleep mode and running on battery but now won't work at all when it is unplugged.
Everytime I start up it comes up with a firmware update icon, screen but says it cannot find the firmware to update.
Please help. The whole point of a MacBook is that it is supposed to be portable and I'm frustrated.
MacBook 13inch 2.0Ghz Intel 2GB Ram Mac OS X (10.4.10) Purchased March 2007

You might try to reset the SMC and/or PRAM.
You might also look here for help with MacBook battery problems.
If you have done this and it did not help contact Apple. Your battery is under warranty and they should be able to help you out.
Mort

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Sorry for my English please Understand =))

This is user to user support site hosted by Apple, who don't want you to jailbreak your device, and don't like jailbreaking to be discussed here. You may get more help on sites that discuss Cydia, or you could try unjailbreaking the device.
tt2

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Morning Clementine Lin,
For more information this, please see this article:
iPhone: Hardware troubleshooting
http://support.apple.com/kb/ts2802
Take a look at the Will not turn on, will not turn on unless connected to power, or unexpected power off section.
Have a nice day,
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Shuts down as soon as unplugged but battery charged 100%... please help

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