Will not turn on unless plugged in to power cord

So I have had my Macbook Pro for about 9 months now. Just today, I unplugged my laptop and it immediately turned off. I tried turning it on; I could hear the optical drive spinning up for a moment, and then the computer would suddenly turn off again.
The battery appears to be fine (I checked the charge indicator on the bottom, and it is fully charged), and my power cord seems to be ok as well.
Any help?

My MacBook Pro is just 4 months old and suddenly it would not operate without power adapter attached. Reset PMU and PRAM to no avail. Repaired permissions and did an fsck in single user mode, again to no avail. Even tried booting in 10.4.10 on external drive which was fine, except laptop would still not work with out being plugged in.
Called Apple. They asked if I had a colleague with a 15" MacBook Pro from whom I might "borrow" their battery from. Luckily, I did! I replaced my battery with hers and bingo! Laptop worked without using power adapter.
Apple is sending new replacement battery.
Another co-worker had the same thing happen to his MacBook Pro this afternoon and his laptop and mine were purchased in the same week.
Wonder if there is another batch of defective batteries springing up.

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How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
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White Batteries http://shop.ebay.com/i.html?_nkw=macbook+white+battery&_sacat=0&LH_BIN=1&_sop=12 &_dmpt=Laptop_Batteries&_odkw=macbook+black+battery&_osacat=0&_trksid=p3286.c0. m 270.l1313
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Hi,
I have reset my iPod, tried turning off and on again dozens of times but every single time I tried to open an app or attempt to play music when it isn't connected to my computer or plugged it shuts off and will not turn back on until I charge it again.
It is 100% charged and every time I take it off charge to turn on, the startup logo appears and switches itself off.

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Reset iOS device: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Restore from backup. See:
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- Restore to factory settings/new iOS device.
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Will not turn on unless plugged in to power cord

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